Add missing meta descriptions

[nlarew]

Adds missing meta descriptions generated by the Education AI Team\n\nSOURCE: https://docs.google.com/spreadsheets/d/1fdrjF4Ms9fMl96zLiLGsYD_V38rTfPLuKs5VQk4vz6E/edit?gid=1166644539

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[github-actions]

The backport to v2.2 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-v2.2 v2.2
# Navigate to the new working tree
cd .worktrees/backport-v2.2
# Create a new branch
git switch --create backport-488-to-v2.2
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 71073851cf14eb4d25d17909b61a494d2cdb9b6a
# Push it to GitHub
git push --set-upstream origin backport-488-to-v2.2
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-v2.2

Then, create a pull request where the base branch is v2.2 and the compare/head branch is backport-488-to-v2.2.