Revert "Doc: Added info on Qt WebSockets module"

This reverts commit 35c81567825c8bfb5c79f867d36a645e1a566a3a.

Information about Qt WebSockets was already added in a
another commit (74d71665).

Change-Id: I1ab4037bbb9f7e24dc60e4f880a44fd98b7f8998
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>