update docs

Author: akenneth

README.md

@@ -538,6 +538,9 @@ The following sets of tools are available (all are on by default):
   - `perPage`: Results per page for pagination (min 1, max 100) (number, optional)
   - `repo`: Repository name (string, required)
 
+- **list_issue_types** - List available issue types
+  - `owner`: The organization owner of the repository (string, required)
+
 - **list_issues** - List issues
   - `after`: Cursor for pagination. Use the endCursor from the previous page's PageInfo for GraphQL APIs. (string, optional)
   - `direction`: Order direction. If provided, the 'orderBy' also needs to be provided. (string, optional)