Categorize deprecations and removals files

What does this MR do and why?

Deprecations and removals MRs cause the Dangerbot to raise the following error.

These files couldn't be categorized, so Danger was unable to suggest a reviewer. Please consider creating a merge request to add support for them.

• data/removals/15_0/15_0-logging.yml

This MR adds data/deprecations and data/removals to the :docs category as an MVC to resolve this error.

Related

More specific guidance and labels regarding these types of changes are in development in the following MRs:

• !80240 (closed)
• !80336 (closed)
• gitlab-com/Product#3817 (closed)

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