KNOWN_BUG #59 is fixed. Clarify support of IPv6 zone IDs.

docs/KNOWN_BUGS

@@ -68,10 +68,6 @@ may have been fixed since this was written!
   is waiting for the the 100-continue response.
   http://curl.haxx.se/mail/lib-2008-08/0462.html
 
-59. If the CURLOPT_PORT option is used on an FTP URL like
-  "ftp://example.com/file;type=A" using a proxy, the ";type=A" is stripped off.
-  See the comment in parse_remote_port()
-
 58. It seems sensible to be able to use CURLOPT_NOBODY and
   CURLOPT_FAILONERROR with FTP to detect if a file exists or not, but it is
   not working: http://curl.haxx.se/mail/lib-2008-07/0295.html
@@ -96,7 +92,7 @@ may have been fixed since this was written!
 
 52. Gautam Kachroo's issue that identifies a problem with the multi interface
   where a connection can be re-used without actually being properly
-  SSL-negoatiated:
+  SSL-negotiated:
   http://curl.haxx.se/mail/lib-2008-01/0277.html
 
 49. If using --retry and the transfer timeouts (possibly due to using -m or
@@ -146,12 +142,13 @@ may have been fixed since this was written!
 30. You need to use -g to the command line tool in order to use RFC2732-style
   IPv6 numerical addresses in URLs.
 
-29. IPv6 URLs with zone ID is not supported.
+29. IPv6 URLs with zone ID is not nicely supported.
   http://www.ietf.org/internet-drafts/draft-fenner-literal-zone-02.txt (expired)
   specifies the use of a plus sign instead of a percent when specifying zone
   IDs in URLs to get around the problem of percent signs being
   special. According to the reporter, Firefox deals with the URL _with_ a
   percent letter (which seems like a blatant URL spec violation).
+  libcurl supports zone IDs where the percent sign is URL-escaped (i.e. %25).
 
    See http://curl.haxx.se/bug/view.cgi?id=1371118
 
@@ -194,7 +191,7 @@ may have been fixed since this was written!
   would not meaningfully support NUL characters within RFC 959 <string>,
   anyway (e.g., UNIX pathnames may not contain NUL).
 
-14. Test case 165 might fail on system which has libidn present, but with an
+14. Test case 165 might fail on a system which has libidn present, but with an
   old iconv version (2.1.3 is a known bad version), since it doesn't recognize
   the charset when named ISO8859-1. Changing the name to ISO-8859-1 makes the
   test pass, but instead makes it fail on Solaris hosts that use its native