update docs

Author: mattdholloway

README.md

@@ -581,19 +581,22 @@ export GITHUB_MCP_TOOL_ADD_ISSUE_COMMENT_DESCRIPTION="an alternative description
   - `repo`: Repository name (string, required)
 
 - **get_discussion_comments** - Get discussion comments
+  - `after`: Cursor for pagination. Use the endCursor from the previous page's PageInfo for GraphQL APIs. (string, optional)
   - `discussionNumber`: Discussion Number (number, required)
   - `owner`: Repository owner (string, required)
   - `page`: Page number for pagination (min 1) (number, optional)
   - `perPage`: Results per page for pagination (min 1, max 100) (number, optional)
   - `repo`: Repository name (string, required)
 
 - **list_discussion_categories** - List discussion categories
+  - `after`: Cursor for pagination. Use the endCursor from the previous page's PageInfo for GraphQL APIs. (string, optional)
   - `owner`: Repository owner (string, required)
   - `page`: Page number for pagination (min 1) (number, optional)
   - `perPage`: Results per page for pagination (min 1, max 100) (number, optional)
   - `repo`: Repository name (string, required)
 
 - **list_discussions** - List discussions
+  - `after`: Cursor for pagination. Use the endCursor from the previous page's PageInfo for GraphQL APIs. (string, optional)
   - `category`: Optional filter by discussion category ID. If provided, only discussions with this category are listed. (string, optional)
   - `owner`: Repository owner (string, required)
   - `page`: Page number for pagination (min 1) (number, optional)