fix(changelog): change fern.yml to docs.yml in 5.26.0 changelog entry

[Ryan-Amirthan]

Description

Fix typo in the 5.26.0 CLI changelog entry: fern.yml → docs.yml. The fern docs link check command auto-detects from docs.yml, not fern.yml.

Changes Made

• Fixed fern.yml → docs.yml in packages/cli/cli/changes/5.26.0/add-docs-check-links.yml
• Fixed fern.yml → docs.yml in packages/cli/cli/versions.yml

Testing

• Manual review — changelog text-only change

Link to Devin session: https://app.devin.ai/sessions/523bc7ee373141128f7eae98bcf71d21
Requested by: @Ryan-Amirthan

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