Fixed innaccurate comments.

SetSourceData etc. is not old style but is there for setting a
data object as an input to a filter rather than connecting the
pipeline. Updated documentation.

Change-Id: Ic5a2bd3b91fec241cf78c2f456f06ee1a57c911d
Merge topic 'fixed-setsource-comments' into master

710f73f5 Fixed innaccurate comments.