Add the three currently discussed bugs that won't make it into the 7.18.0

release but hopefully they'll all be fixed in 7.18.1...

docs/KNOWN_BUGS

@@ -3,6 +3,18 @@ join in and help us correct one or more of these! Also be sure to check the
 changelog of the current development status, as one or more of these problems
 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:
+  http://curl.haxx.se/mail/lib-2008-01/0277.html
+
+51.Kevin Reed's reported problem with a proxy when doing CONNECT and it
+  wants NTLM and close the connection to the initial CONNECT response:
+  http://curl.haxx.se/bug/view.cgi?id=1879375
+
+50. Curl_done() and pipelning aren't totally cool together:
+  http://curl.haxx.se/mail/lib-2008-01/0330.html
+
 49. If using --retry and the transfer timeouts (possibly due to using -m or
   -y/-Y) the next attempt doesn't resume the transfer properly from what was
   downloaded in the previous attempt but will truncate and restart at the