opts: more man pages

docs/libcurl/opts/CURLOPT_CAINFO.3

docs/libcurl/opts/CURLOPT_FILETIME.3

docs/libcurl/opts/CURLOPT_FORBID_REUSE.3

docs/libcurl/opts/CURLOPT_FRESH_CONNECT.3

docs/libcurl/opts/CURLOPT_HTTPPROXYTUNNEL.3

docs/libcurl/opts/CURLOPT_INTERFACE.3

docs/libcurl/opts/CURLOPT_KRBLEVEL.3

docs/libcurl/opts/CURLOPT_MAXCONNECTS.3

docs/libcurl/opts/CURLOPT_MAXREDIRS.3

docs/libcurl/opts/CURLOPT_POSTFIELDSIZE.3

docs/libcurl/opts/CURLOPT_PROXYPORT.3

docs/libcurl/opts/CURLOPT_RANDOM_FILE.3

docs/libcurl/opts/CURLOPT_SSL_VERIFYPEER.3

docs/libcurl/opts/CURLOPT_TELNETOPTIONS.3