Updates README for clarity and consistency

Updates the README file to improve readability and ensure consistency in formatting and content.

Specifically, this commit:
- Changes a level 1 heading to a level 2 heading for better structure.
- Adds a comment to the required_body example to clarify its usage.

Author: paulcruse3

README.md

@@ -1,6 +1,6 @@
 # 🫐 Acai AWS
 
-**Auto-loading, self-validating, minimalist Python framework for Amazon Web Service Lambdas**
+## Auto-loading, self-validating, minimalist Python framework for Amazon Web Service Lambdas
 
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@@ -112,7 +112,7 @@ from acai_aws.apigateway.requirements import requirements
 
 @requirements(
     auth_required=True,
-    required_body={
+    required_body={ # can be a dataclass or reference to a schema in openapi.yml
         'type': 'object',
         'required': ['email', 'name'],
         'properties': {