man: fix typo and improve wording

doc/mat2.1

@@ -73,9 +73,9 @@ This is why you shouldn't rely on metadata's presence to decide if your file mus
 be cleaned or not.
 .PP
 Moreover, mat2 goes to great lengths to make sure that as much metadata as
-possible are removed. This might sometimes results in a loss of quality of the
-processed files. If you're experiencing this, you might want to give a try at
-the lightweigtht cleaning mode, but keep in mind by doing so, some metadata
+possible are removed. This might sometimes result in a loss of quality of the
+processed files. If you're experiencing this, you might want to give the
+lightweigtht cleaning mode a try, but keep in mind by doing so, some metadata
 \fBwon't be cleaned\fR.