Update docs for issues REST API tasks addition
What does this MR do and why?
You can now fetch issues and filter them by task type.
You can also create/update issues and set the task type to them. This is a doc only change, the change was merged previously
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #368055