curl.1: add a missing dash

docs/curl.1

@@ -977,7 +977,7 @@ re-send the following request using the same unmodified method.
 
 You can tell curl to not change the non-GET request method to GET after a 30x
 response by using the dedicated options for that: \fI--post301\fP,
-\fI--post302\fP and \fI-post303\fP.
+\fI--post302\fP and \fI--post303\fP.
 .IP "--libcurl <file>"
 Append this option to any ordinary curl command line, and you will get a
 libcurl-using C source code written to the file that does the equivalent