KNOWN_BUGS: remove 92 and 88, fixed

docs/KNOWN_BUGS

@@ -9,17 +9,6 @@ may have been fixed since this was written!
   purpose char* for storing these values in via casting. For more information
   see the now closed related issue:
   https://github.com/curl/curl/issues/608
-  
-92. curl tool 7.47.1 in Windows will not --output to literal paths \\?\ or to
-  reserved dos device names unless the device prefix \\.\ is used. To send
-  output to a device that has a reserved dos device name you can use the
-  Windows device prefix (eg: --output \\.\NUL). You can also use the
-  redirection operator to send output to a literal path or a reserved device
-  name (eg: > NUL).
-  The next release of curl will support --output in Windows to literal paths
-  and to reserved device names without the device prefix.
-  https://github.com/curl/curl/commit/c3aac48
-  https://github.com/curl/curl/commit/4fc80f3
 
 91. "curl_easy_perform hangs with imap and PolarSSL"
   https://github.com/curl/curl/issues/334
@@ -33,9 +22,6 @@ may have been fixed since this was written!
 89. Disabling HTTP Pipelining when there are ongoing transfers can lead to
   heap corruption and crash. https://curl.haxx.se/bug/view.cgi?id=1411
 
-88. libcurl doesn't support CURLINFO_FILETIME for SFTP transfers and thus
-  curl's -R option also doesn't work then.
-
 87. -J/--remote-header-name doesn't decode %-encoded file names. RFC6266
   details how it should be done. The can of worm is basically that we have no
   charset handling in curl and ascii >=128 is a challenge for us. Not to