Fix issues with the API documentation

[LinuxJedi]

Description

Fixes API header mismatches between API and documentation.

[devin-ai-integration]

🛟 Devin Lifeguard found 2 likely issues in this PR

• do-not-change-external-apis snippet snippet snippet: Restore the original prototypes (e.g., keep int wc_AesFree(Aes* aes)), and introduce new versions such as wc_AesFree_ex(Aes* aes) or similar wrappers with the updated return type/parameters, having the old functions call the new ones with default values.
• no-void-functions snippet: Revert wc_AesFree (and any other newly-changed APIs) to return an int and ensure the implementation returns an appropriate error code so callers can detect failures.

@LinuxJedi
please take a look at the above issues which Devin flagged. Devin will not fix these issues automatically.