Use more concise cross-referencing syntax in docs

[AdeelH]

Overview

This PR replaces cross-references of the form

:class:`~a.b.c.d`

with

:class:`.d`

in ReST files.

Checklist

• Added needs-backport label if PR is bug fix that applies to previous minor release
• Ran scripts/format_code and committed any changes
• Documentation updated if needed
• PR has a name that won't get you publicly shamed for vagueness

Notes

N/A

Testing Instructions

• See if links still work in rendered docs.