add missing doc templates back

[DanRoscigno]

Adding markdown templates (fixes #51747 )

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Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[robot-ch-test-poll4]

This is an automated comment for commit 1ab414a with description of existing statuses. It's updated for the latest CI running
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The overall status of the commit is 🟡 pending

Check name	Description	Status
CI running	A meta-check that indicates the running CI. Normally, it's in success or pending state. The failed status indicates some problems with the PR	🟡 pending
Mergeable Check	Checks if all other necessary checks are successful	🟢 success
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Style Check	Runs a set of checks to keep the code style clean. If some of tests failed, see the related log from the report	🟢 success