Clarify get_review_comments description

Author: almaleksia

pkg/github/pullrequests.go

@@ -33,7 +33,7 @@ Possible options:
  2. get_diff - Get the diff of a pull request.
  3. get_status - Get status of a head commit in a pull request. This reflects status of builds and checks.
  4. get_files - Get the list of files changed in a pull request. Use with pagination parameters to control the number of results returned.
- 5. get_review_comments - Get the review comments on a pull request. Use with pagination parameters to control the number of results returned.
+ 5. get_review_comments - Get the review comments on a pull request. They are comments made on a portion of the unified diff during a pull request review. These are different from commit comments and issue comments in a pull request. Use with pagination parameters to control the number of results returned.
  6. get_reviews - Get the reviews on a pull request. When asked for review comments, use get_review_comments method.
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