do not use `a' quoting style in comments

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/hostname.c b/networking/hostname.c
index 4b305d2..7d7c60d 100644
--- a/networking/hostname.c
+++ b/networking/hostname.c
@@ -114,7 +114,7 @@
  *  { bbox: not supported }
  * -F, --file filename
  *  Read the host name from the specified file. Comments (lines
- *  starting with a `#') are ignored.
+ *  starting with a '#') are ignored.
  */
 int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int hostname_main(int argc UNUSED_PARAM, char **argv)