address code review

Author: toumorokoshi

aep/general/0102/aep.md.j2

@@ -28,7 +28,8 @@ The API Name:
 - **must** only use valid domain name characters as specified in
   [RFC 1035](https://datatracker.ietf.org/doc/html/rfc1035#section-2.3.1), or a
   slash `[.-a-z0-9/]`)
-- **must** use all lower case.
+- **must** use all lowercase.
+- **must** start with a lowercase letter.
 - **should not** use path prefixes that could also be misconstrued as a
   resource collection (e.g. `apis.examples.com/users`)