Update README.md

Author: stevespringett

types/README.md

@@ -1,16 +1,16 @@
-###PURL Type Definitions
+### PURL Type Definitions
 
 This directory contains the machine-readable definitions of all registered Package-URL (PURL) types,
 one JSON file for each type. These JSON files serve as the reference for PURL type specifications.
 
-##Contents
+## Contents
 
 - **index.json**: The index of all registered PURL types as a simple list of types.
 - Definitions: **<purl-type>-definition.json**: The definition for a specific PURL type (e.g.,
   maven-definition.json, npm-definition.json).
 - Tests: **<purl-type>-test.json**: The test suite for a specific PURL type.
 
-##Definitions
+## Definitions
 
 Each JSON file named *-definition.json in this directory follows the standard PURL Type Definition
 Schema, ensuring:
@@ -19,7 +19,7 @@ Schema, ensuring:
 - Machine-readability for validation and automation.
 - Standardized structure defining namespace, name, version, qualifiers, subpath, and repository behavior.
 
-##Tests
+## Tests
 
 Each JSON file named *-test.json in this directory follows the standard PURL Test Schema, ensuring:
 
@@ -29,13 +29,12 @@ Each JSON file named *-test.json in this directory follows the standard PURL Tes
   advanced processing including flexible, recovering parsing of invalid PURL.
 
 
-
-##Usage
+## Usage
 
 - These JSON files are the the authoritative source for defining, validating and tesing PURL types.
 - They should be referenced by tools, libraries, and documentation generators.
 
-##Contributions
+## Contributions
 
 - Modifications must be made to these JSON files directly.
 - The type definitions, tests and index and validated for consistency on commit.