cherrypick from lmp-docs Docs: Correcting how to escape quotes.

Original Change-Id: I417546a473f0ebe76a6e4102b87883a85365ac26

The behavior for single and double-quotes is different--I expanded
this section to note how they differ.

bug: 19959941
Change-Id: I9be9c066c416e9403a3ac164af0b1ce35f7ab1dd