minor update

adding a space after comma

pages/common/mc.md

@@ -1,7 +1,7 @@
 # mc
 
 > Midnight Commander, a terminal based file manager.
-> Navigate the folder structure using the arrow keys,the mouse or by typing the commands into the terminal.
+> Navigate the folder structure using the arrow keys, the mouse or by typing the commands into the terminal.
 
 - Start mc: