Address code review feedback: fix documentation syntax and handle legacy release branches

[Copilot]

Addresses code review comments on the DocFX migration PR. Fixes documentation syntax errors and prevents deployment failures when release branches lack DocFX configuration.

Documentation syntax corrections:

• Fixed invalid C# variable declaration syntax (timeUnit: TimeUnit → var timeUnit)
• Fixed markdown inline code formatting (double backticks → single backticks)
• Improved lambda parameter naming for clarity (culture → cultureInfo)

Build script hardening:

• Guard release loop execution when no release branches exist
• Skip branches missing docs/docfx.json (legacy Jekyll-only branches)
• Track successfully built versions separately from attempted versions
• Continue deployment when individual branch builds fail instead of aborting

The script now checks for DocFX configuration before attempting builds:

if [ ! -f "$worktree/docs/docfx.json" ]; then
  echo "Skipping $version: no DocFX configuration found"
  continue
fi

Only successfully built versions are included in the deployment artifact and versions.json manifest.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Copilot]

Pull Request Overview

This PR improves documentation consistency and enhances the DocFX build script with better error handling. The changes ensure that only successfully built documentation versions are included in the final site.

• Fixed code example formatting and syntax in documentation
• Renamed lambda parameter for clarity and consistency
• Added robust error handling and validation to the DocFX build script

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
docs/time-unit-symbols.md	Fixed code example syntax and markdown backtick formatting
docs/configuration.md	Renamed lambda parameter from culture to cultureInfo for consistency
.github/workflows/scripts/build-docfx.sh	Added error handling, version tracking, and validation for DocFX builds