tst_qfont: Fix small typo

Change-Id: I7e007202b0cc80a1808831ebcf46ae7ec0866828
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
doc: fix grammar

Change-Id: Ic2e5fd40e3d3bd7b42d5fd6492286770ffe244f3
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>