docs: fix broken internal markdown links

Summary

Several docs files contain broken internal links to other markdown files that have been moved or renamed:

| Source file | Broken link | Issue | |------------|-------------|-------| | docs/additional-configs.md | ../api_compatibility_policy.md | File has been moved or renamed | | docs/deprecations.md | ../api_compatibility_policy.md | Same — points to non-existent file | | docs/pipelines.md | runs.md (2 occurrences) | runs.md does not exist in docs/ | | docs/podtemplates.md | #./workspaces.md | Malformed link (has #. prefix) |

How to find them

for f in docs/*.md; do
  grep -oP '\]\(([^)]+\.md)' "$f" | sed 's/\](//' | while read link; do
    target="docs/$link"
    [[ "$link" == ../* ]] && target="$link"
    [ ! -f "$target" ] && [[ ! "$link" == http* ]] && echo "BROKEN: $f -> $link"
  done
done

What to do

1. For each broken link, find the correct target file (it may have been renamed or moved)
2. Update the link to point to the correct location
3. For #./workspaces.md, fix the malformed anchor syntax

How to verify

• Run the find script above and confirm zero broken links
• Ensure the markdown renders correctly on GitHub

/kind documentation