Document qRemovePostRoutine() function and update qAddPostRoutine() doc

The qRemovePostRoutine() function has been added as publicly exported
function in Qt 2.2.0 with behavior equivalent to that of today. It has
never been documented for unknown reasons, possibly simply forgotten.

This function provides needed symmetry for the already documented
qAddPostRoutine() function and is used in some real world applications.

Change-Id: Ied4709505d8335c883e9791ea634df8fb406d995
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Nico Vertriest <nico.vertriest@digia.com>

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