opts: added some "SEE ALSO" references

docs/libcurl/opts/CURLOPT_ACCEPT_ENCODING.3

@@ -60,3 +60,4 @@ Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
 CURLE_OUT_OF_MEMORY if there was insufficient heap space.
 .SH "SEE ALSO"
 .BR CURLOPT_TRANSFER_ENCODING "(3), " CURLOPT_HTTPHEADER "(3), "
+.BR CURLOPT_HTTP_CONTENT_DECODING "(3), "

docs/libcurl/opts/CURLOPT_HTTP_CONTENT_DECODING.3

@@ -46,3 +46,4 @@ Added in 7.16.2
 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
 .SH "SEE ALSO"
 .BR CURLOPT_STDERR "(3), " CURLOPT_DEBUGFUNCTION "(3), "
+.BR CURLOPT_ACCEPT_ENCODING "(3) "