Correct QSoundEffect::supportedMimeTypes() documentation.
Correct QSoundEffect::supportedMimeTypes() documentation.

Change-Id: I154b124949ee4f07ea413d8cdb419fcc08cb8324
Reviewed-by: Topi Reiniö <92400b03a70fe3119347f89b476f73d34ae93598@digia.com>

mer-qt/qtmultimedia,mer-qt/qtmultimedia,mer-qt/qtmultimedia,mer-qt/qtmultimedia,mer-qt/qtmultimedia