doc: remove one trailing space in the man page

Signed-off-by: Antoine Tenart <antoine.tenart@ack.tf>

doc/mat2.1

@@ -8,7 +8,7 @@ mat2 \- the metadata anonymisation toolkit 2
 
 .SH DESCRIPTION
 .B mat2
-removes metadata from various fileformats. It supports a wide variety of file 
+removes metadata from various fileformats. It supports a wide variety of file
 formats, audio, office, images, …
 
 Careful, mat2 does not clean files in-place, instead, it will produce a file with the word