Update cms-pages.md

Fix yo tags dude!
Merge pull request #1 from Garbee/patch-1

Update cms-pages.md
Frontend AJAX doc spelling changes.
Merge pull request #2 from KB1RMA/almightygrammar

Frontend AJAX doc spelling changes.
Pages spelling changes
Partial spelling/wording
Theme spelling/wording
Components spelling/wording
Avenge the war on the oxford comma.
Merge pull request #3 from KB1RMA/almightygrammar

Basic spelling fixes
Update plugin info definition example
Create markup guide
Create installation guide draft
Revise markup content
Minor
Add statement to introduce default placeholder content
Add some database docs
Add model docs
Add db schema docs
Minor