Fix typo in documentation (#1330)

Signed-off-by: Stefan Weil <[email protected]>

Author: stweil

doc/combine_tessdata.1.asc

@@ -61,7 +61,7 @@ OPTIONS
 
 *-o* '.traineddata' 'FILE'...:
     Overwrites the specified components of the .traineddata file
-    with those provided on the comand line.
+    with those provided on the command line.
 
 *-u* '.traineddata' 'PATHPREFIX'
     Unpacks the .traineddata using the provided prefix.