removed nroff mistake

docs/libcurl/curl_formadd.3

@@ -49,7 +49,7 @@ length of the name with \fBCURLFORM_NAMELENGTH\fP.
 .B CURLFORM_COPYCONTENTS
 followed by a string is used for the contents of this part, the actual data to
 send away. libcurl copies the given data, so your application doesn't need to
-keep it around after this function call (\f). If the data isn't zero terminated
+keep it around after this function call. If the data isn't zero terminated
 properly, or if you'd like it to contain zero bytes, you need to set the
 length of the name with \fBCURLFORM_CONTENTSLENGTH\fP.