Refs #8632. Fixing MantidPlot and MantidQt doxygen errors.
Refs #8632. Fixing a missed error.
Revert "Refs #8632. Fixing MantidPlot and MantidQt doxygen errors."

This reverts commit b37ca8023d40d1dea64faf68b6b0bb64fdce564e.
Refs #8632. Fixing some MantidPlot errors.
Merge branch 'feature/8632_doxygen_errors' into develop