minor format fix

docs/libcurl/curl_multi_fdset.3

@@ -4,6 +4,7 @@
 .SH NAME
 curl_multi_fdset - extracts file descriptor information from a multi handle
 .SH SYNOPSIS
+.nf
 #include <curl/curl.h>
 
 CURLMcode curl_multi_fdset(CURLM *multi_handle,
@@ -23,6 +24,6 @@ as libcurl will need to be able to read them. It needs them after select()
 calls, to know if certain sockets are readable or writable.
 .SH RETURN VALUE
 CURLMcode type, general libcurl multi interface error code. See
-\fIlibcurl-errors.3\fP
+\fIlibcurl-errors(3)\fP
 .SH "SEE ALSO"
 .BR curl_multi_cleanup "(3)," curl_multi_init "(3)"