Add core-maintainers to /docs/ CODEOWNERS

Allow core maintainers to approve general documentation changes,
not just specification docs. This gives core maintainers broader
authority over all documentation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: olaservo

.github/CODEOWNERS

@@ -1,7 +1,7 @@
 # CODEOWNERS file for MCP Specification repository
 
-# General documentation ownership - @modelcontextprotocol/docs-maintaners owns all of /docs
-/docs/ @modelcontextprotocol/docs-maintaners
+# General documentation ownership - @modelcontextprotocol/docs-maintaners and core-maintainers own all of /docs
+/docs/ @modelcontextprotocol/docs-maintaners @modelcontextprotocol/core-maintainers
 
 # Specific ownership - @core-maintainer team owns docs/specification and schema/ directories
 /docs/specification/ @modelcontextprotocol/core-maintainers