add shortcode examples on faq

git-svn-id: https://plugins.svn.wordpress.org/yakadanda-google-hangout-events/trunk@887216 b8457f37-d9ea-0310-8a92-e5e31aec5664
add shortcode attributes on faq

git-svn-id: https://plugins.svn.wordpress.org/yakadanda-google-hangout-events/trunk@887217 b8457f37-d9ea-0310-8a92-e5e31aec5664