curl_multi_socket_action.3: mark the options properly

... to make them appear as links on the html version.

docs/libcurl/curl_multi_socket_action.3

@@ -51,14 +51,15 @@ decreases by one, it DOES NOT necessarily mean that this exact socket/transfer
 is the one that completed. Use \fIcurl_multi_info_read(3)\fP to figure out
 which easy handle that completed.
 
-The \fBcurl_multi_socket_action(3)\fP functions inform the application about
+The \fIcurl_multi_socket_action(3)\fP functions inform the application about
 updates in the socket (file descriptor) status by doing none, one, or multiple
-calls to the socket callback function set with the CURLMOPT_SOCKETFUNCTION
-option to \fIcurl_multi_setopt(3)\fP. They update the status with changes
-since the previous time the callback was called.
+calls to the socket callback function set with the
+\fICURLMOPT_SOCKETFUNCTION(3)\fP option to \fIcurl_multi_setopt(3)\fP. They
+update the status with changes since the previous time the callback was
+called.
 
-Get the timeout time by setting the \fICURLMOPT_TIMERFUNCTION\fP option with
-\fIcurl_multi_setopt(3)\fP. Your application will then get called with
+Get the timeout time by setting the \fICURLMOPT_TIMERFUNCTION(3)\fP option
+with \fIcurl_multi_setopt(3)\fP. Your application will then get called with
 information on how long to wait for socket actions at most before doing the
 timeout action: call the \fBcurl_multi_socket_action(3)\fP function with the
 \fBsockfd\fP argument set to CURL_SOCKET_TIMEOUT. You can also use the