Add intro to any Chrome app API with no overview docs.
This intro has a very brief description of the API usage and a link to any related docs,
if available.
At the moment, the related docs are in the heading 4.
In a separate cl, I will add 'Availabile in' information, and may use a table format for both related doc and available in.
This cl also includes broken link fixes to app_hardware.html.
Note: this does not include experimental APIs or APIs with existing intros.
Additional improvements to be made in separate cls.
Review URL: https://codereview.chromium.org/
11412117
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170567 0039d316-1c4b-4281-b951-d872f2087c98