Prevent users from adding more than 100 pinned comments and document it

Problem Definition

Confluence allows us to add as many pinned comments to attachments like PDFs as we want.

However, due to a limitation in REST API, it can only load 100 of these, so adding more than 100 will cause these to not be loaded the next time the attachment is opened, even though they are present in the database.

Suggested Solution

Two changes:

1. Prevent users from adding more than 100 pinned comments to a single version of an attachment.
2. Add this limitation to the documentation