fix(AIP-192): Expand deprecated comment requirement to all components (#1198)

Author: parthea

aip/general/0192.md

@@ -116,8 +116,8 @@ trademark owner's current branding.
 
 ### Deprecations
 
-To deprecate a service or RPC, the `deprecated`
-[option](https://developers.google.com/protocol-buffers/docs/proto#options)
+To deprecate a component (service, method, message, field, enum, or enum value),
+the `deprecated` [option](https://developers.google.com/protocol-buffers/docs/proto#options)
 **must** be set to `true`, and the first line of the respective comment
 **must** start with `"Deprecated: "` and provide alternative solutions for
 developers. If there is no alternative solution, a deprecation reason **must**
@@ -144,6 +144,7 @@ of inadvertent omissions of the internal content annotation.
 
 ## Changelog
 
+- **2023-08-11**: Expand deprecated comment requirement to all components.
 - **2021-04-20**: Added guidance for deprecated services and RPCs.
 - **2020-04-01**: Added guidance requiring absolute URLs for external links.
 - **2020-02-14**: Added guidance around the use of trademarked names.