docs: add curl_global_trace to some SEE ALSO sections

Closes curl#11791

Author: bagder

docs/libcurl/curl_global_init.3

@@ -116,5 +116,6 @@ other curl functions.
 .BR curl_global_init_mem "(3), "
 .BR curl_global_cleanup "(3), "
 .BR curl_global_sslset "(3), "
-.BR curl_easy_init "(3) "
-.BR libcurl "(3) "
+.BR curl_easy_init "(3), "
+.BR libcurl "(3), "
+.BR curl_global_trace "(3), "

docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3

@@ -191,3 +191,4 @@ Always
 Returns CURLE_OK
 .SH "SEE ALSO"
 .BR CURLOPT_VERBOSE "(3), " CURLOPT_DEBUGDATA "(3), "
+.BR curl_global_trace "(3), "

docs/libcurl/opts/CURLOPT_VERBOSE.3

@@ -66,3 +66,4 @@ Returns CURLE_OK
 .SH "SEE ALSO"
 .BR CURLOPT_STDERR "(3), " CURLOPT_DEBUGFUNCTION "(3), "
 .BR CURLOPT_ERRORBUFFER "(3), "
+.BR curl_global_trace "(3), "