Remove xref from leader pinning glossary partial

[kbatuigas]

Description

This pull request makes a minor documentation update by removing a reference link from the leader-pinning.adoc partial.

Resolves https://redpandadata.atlassian.net/browse/
Review deadline:

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Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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