docs(dev): fix OCS Share API success statuscodes for v2 (200) - #15718

Summary

Correct OCS Share API success statuscodes for the documented /ocs/v2.php base URL.

• Document that OCS v2 returns meta <statuscode> 200 on success (v1 used 100).
• Replace outdated 100 - successful bullets with 200 - successful so they match the v2 base URL and the already-correct send-email endpoint.
• Error codes left unchanged.

Closes #10899

Test plan

• Sphinx build of the developer manual succeeds for ocs-share-api.rst
• Intro note explains v2 → 200 vs v1 → 100
• Every local + federated endpoint success bullet is 200 - successful (including Create)
• send-email still lists 200 - successful (no duplicate/regression)
• No unrelated edits (hideDownload / shared_with_me live in a separate prep if needed)

AI disclosure

This PR was drafted with the help of AI coding assistants (Cursor agents / LLM-based tools), including the description. I am responsible for it and happy to rework anything that doesn't fit.

All commits carry an Assisted-by: Cursor:grok-4.7 trailer.