Fix usage of double quote instead of simple quote

Syntax color is broken in the README file, using simple quote
instead of double quote

Change-Id: I5af4b22418dd734367dbdc696f8f816c9bc48ee6
(cherry picked from commit ef3b4eb55cc1a27591112a292e22bb6c81a4828e)
Merge "Fix usage of double quote instead of simple quote" into stable/havana