Use bold for keyboard shortcuts in dmenu.1

Like dwm, use the same syntax for all keyboard shortcuts for
consistency.

dmenu.1

@@ -106,88 +106,88 @@ Move cursor to the start of the current word
 .B Ctrl-Right
 Move cursor to the end of the current word
 .TP
-C\-a
+.B C\-a
 Home
 .TP
-C\-b
+.B C\-b
 Left
 .TP
-C\-c
+.B C\-c
 Escape
 .TP
-C\-d
+.B C\-d
 Delete
 .TP
-C\-e
+.B C\-e
 End
 .TP
-C\-f
+.B C\-f
 Right
 .TP
-C\-g
+.B C\-g
 Escape
 .TP
-C\-h
+.B C\-h
 Backspace
 .TP
-C\-i
+.B C\-i
 Tab
 .TP
-C\-j
+.B C\-j
 Return
 .TP
-C\-J
+.B C\-J
 Shift-Return
 .TP
-C\-k
+.B C\-k
 Delete line right
 .TP
-C\-m
+.B C\-m
 Return
 .TP
-C\-M
+.B C\-M
 Shift-Return
 .TP
-C\-n
+.B C\-n
 Down
 .TP
-C\-p
+.B C\-p
 Up
 .TP
-C\-u
+.B C\-u
 Delete line left
 .TP
-C\-w
+.B C\-w
 Delete word left
 .TP
-C\-y
+.B C\-y
 Paste from primary X selection
 .TP
-C\-Y
+.B C\-Y
 Paste from X clipboard
 .TP
-M\-b
+.B M\-b
 Move cursor to the start of the current word
 .TP
-M\-f
+.B M\-f
 Move cursor to the end of the current word
 .TP
-M\-g
+.B M\-g
 Home
 .TP
-M\-G
+.B M\-G
 End
 .TP
-M\-h
+.B M\-h
 Up
 .TP
-M\-j
+.B M\-j
 Page down
 .TP
-M\-k
+.B M\-k
 Page up
 .TP
-M\-l
+.B M\-l
 Down
 .SH SEE ALSO
 .IR dwm (1),