Remove the unused doc path heat/doc

Resource doc generation has been moved to doc/source/ext.

Change-Id: I7709e9f98aac8de7619ab6eda8a5f8b0488af67c
Fix typo

Change-Id: Ic34fcc5c0cd6f27af6b890eb1e59eabc24cdf42c
Merge "Remove the unused doc path heat/doc"
Merge "Fix typo"