Adds a new option to wait_for to wait for a file to exist on the file
system before continuing, optionally takes a search_regex param to match
text in the file.
Migrated all examples: in DOCUMENTATION=''' string to standalone EXAMPLES=''' string
Added deprecation warning to moduledev.rst and remove deprecated example from it
Fixed up a few typos and uppercased some acronyms.
add consistency to how EXAMPLES are formatted
And also be liberal in what ansible-doc accepts as an empty
requirements specification.
While here fix a typo in template module documentation
wrt jinja2 overrides example.
