feat(AIP-9) add section headers (#1051)

Section headers produce anchor links which allows for the
ability to link to Glossary terms in other AIPs.

Sections have been organized alphabetically for easier discovery.

This change is purely organizational. No content was changed
as part of this commit.

Author: toumorokoshi

aip/general/0009.md

@@ -16,68 +16,104 @@ than in each AIP individually.
 
 The following terminology **should** be used consistently throughout AIPs.
 
-API : Application Programming Interface. This can be a local interface (such as
-a client library) or a Network API (defined below).
-
-Network API : An API that operates across a network of computers. Network APIs
-communicate using network protocols including HTTP, and are frequently produced
-by organizations separate from those that consume them.
+### API
 
-Google API : A Network API exposed by a Google service. Most of these are
-hosted on the `googleapis.com` domain. It does not include other types of APIs,
-such as client libraries and SDKs.
-
-API Definition : The definition of an API, usually defined in a Protocol Buffer
-service. An API Definition can be implemented by any number of API Services.
+Application Programming Interface. This can be a local interface (such as
+a client library) or a Network API (defined below).
 
-API Version : The version of an API or a group of APIs if they are defined
-together. An API Version is often represented by a string, such as "v1", and
-presents in API requests and Protocol Buffers package names.
+### API Backend
 
-API Method : An individual operation within an API. It is typically represented
-in Protocol Buffers by an `rpc` definition, and is mapped to a function in the
-API in most programming languages.
+A set of servers and related infrastructure that implements the
+business logic for an API Service. An individual API backend server is often
+called an API server.
 
-API Request : A single invocation of an API Method. It is often used as the
-unit for billing, logging, monitoring, and rate limiting.
+### API Consumer
 
-API Consumer : The entity that consumes an API Service. For Google APIs, it
+The entity that consumes an API Service. For Google APIs, it
 typically is a Google project that owns the client application or the server
 resource.
 
-API Producer : The entity that produces an API Service. For Google APIs, it
-typically is a Google team responsible for the API Service.
+### API Definition
 
-API Backend : A set of servers and related infrastructure that implements the
-business logic for an API Service. An individual API backend server is often
-called an API server.
+The definition of an API, usually defined in a Protocol Buffer
+service. An API Definition can be implemented by any number of API Services.
 
-API Frontend : A set of servers plus related infrastructure that provides
+### API Frontend
+
+A set of servers plus related infrastructure that provides
 common functionality across API Services, such as load balancing and
 authentication. An individual API frontend server is often called an API proxy.
 
 **Note:** the API frontend and the API backend may run next to each other or
 far away from each other. In some cases, they can be compiled into a single
 application binary and run inside a single process.
 
-API Service : A deployed implementation of one or more APIs, exposed on one or
-more network addresses, such as the Cloud Pub/Sub API.
+### API Method
 
-API Service Name : Refers to the logical identifier of an API Service. Google
-APIs use RFC 1035 DNS compatible names as their API Service Names, such as
-`pubsub.googleapis.com`.
+An individual operation within an API. It is typically represented
+in Protocol Buffers by an `rpc` definition, and is mapped to a function in the
+API in most programming languages.
 
-API Service Endpoint : Refers to a network address that an API Service uses to
-handle incoming API Requests. One API Service may have multiple API Service
-Endpoints, such as `https://pubsub.googleapis.com` and
-`https://content-pubsub.googleapis.com`.
+### API Producer
+
+The entity that produces an API Service. For Google APIs, it
+typically is a Google team responsible for the API Service.
 
-API Product : An API Service and its related components, such as Terms of
+### API Product
+
+An API Service and its related components, such as Terms of
 Service, documentation, client libraries, and service support, are collectively
 presented to customers as a API Product. For example, Google Calendar API.
 
 **Note:** people sometimes refer to an API Product simply as an API.
 
-API Service Definition : The combination of API Definitions (`.proto` files)
+### API Service
+
+A deployed implementation of one or more APIs, exposed on one or
+more network addresses, such as the Cloud Pub/Sub API.
+
+### API Service Definition
+
+The combination of API Definitions (`.proto` files)
 and API Service configurations (`.yaml` files) used to define an API Service.
 The schema for Google API Service Definition is `google.api.Service`.
+
+### API Service Endpoint
+
+Refers to a network address that an API Service uses to
+handle incoming API Requests. One API Service may have multiple API Service
+Endpoints, such as `https://pubsub.googleapis.com` and
+`https://content-pubsub.googleapis.com`.
+
+### API Service Name
+
+Refers to the logical identifier of an API Service. Google
+APIs use RFC 1035 DNS compatible names as their API Service Names, such as
+`pubsub.googleapis.com`.
+
+### API Request
+
+A single invocation of an API Method. It is often used as the
+unit for billing, logging, monitoring, and rate limiting.
+
+### API Version
+
+The version of an API or a group of APIs if they are defined
+together. An API Version is often represented by a string, such as "v1", and
+presents in API requests and Protocol Buffers package names.
+
+### Google API
+
+A Network API exposed by a Google service. Most of these are
+hosted on the `googleapis.com` domain. It does not include other types of APIs,
+such as client libraries and SDKs.
+
+### Network API
+
+An API that operates across a network of computers. Network APIs
+communicate using network protocols including HTTP, and are frequently produced
+by organizations separate from those that consume them.
+
+## Changelog
+
+- **2023-03-24**: Reformatting content to include anchor links.