small typo

mock/docs/mock.1

@@ -312,7 +312,7 @@ Change directory where config files are found
 Override configuration option. Can be used multiple times.
 
 When used multiple times for the same key, it will create an array (if you need
-to specify an array value with just a sigle item, e.g.
+to specify an array value with just a single item, e.g.
 \fIconfig_opts["foo"] = ["baz"]\fR, specify it as array of two items with the
 empty string as the first item, e.g.  \fI--config-opts=foo=
 --config-opts=foo=baz\fR).