KDB-918 yahoo example fix

Add documentation feedback issue form

Mirrors the docs feedback template used on GitLab so q docs issues
are routed the same way.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

Correct .z.c description: logical CPUs, not physical cores

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Merge pull request #487 from KxSystems/footer-copyright-2026

Update site footer copyright and trademark notice

4.1 2026.10.23 release

fix indenting

fix file text indent

update titles of section

Clarify download link for kdb+ installation

Updated download link text for clarity.

kdb+ 4.1 2026.10.02 release notes

Added release notes for version 4.1, including new features and fixes.