fix: bump release notes v4.1.5 to v4.1.6

[chideat]

Summary

• v4.1.5 had bugs, so republish the release as v4.1.6.
• Bump the compatibility & support matrix row v4.1.5 → v4.1.6.
• Bump the release-notes section heading v4.1.5 → v4.1.6.

The Fixed Issues placeholder is intentionally left at mw-redis-v4.1.4-fixed (unchanged from the prior version reset).

Test plan

• Docs-only change; confirmed no remaining 4.1.5 references in the docs tree.

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Pull request overview

This docs-only PR republishes the release notes and compatibility matrix entry from v4.1.5 to v4.1.6.

Changes:

• Updated the compatibility/support matrix version row to v4.1.6.
• Updated the release notes section heading to v4.1.6.
• Verified there are no remaining 4.1.5 references in the docs tree.

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