Fix MD output formatting not escaping HTML special characters.
Fix MD output formatting not escaping HTML special characters.

googlecodelabs/tools,googlecodelabs/tools,Qwiklabs/codelab-tools,Qwiklabs/codelab-tools,googlecodelabs/tools,Qwiklabs/codelab-tools,Qwiklabs/codelab-tools,googlecodelabs/tools