[doc] Update tar.bz2 mime type

 * Unify the content type of gzip compressed tars to application/x-gtar-compressed
 * Unify the content type of bzip2 compressed tars to application/x-bzip-compressed-tar

Exact reasoning will be provided in the PR.

Author: ToMe25

doc/scripts/create-mime.conf.pl

@@ -177,10 +177,11 @@ sub print_type {
 
 # other useful mappings
 my %useful = (
+	".tgz"     => "application/x-gtar-compressed",
 	".tar.gz"  => "application/x-gtar-compressed",
 	".gz"      => "application/gzip",
-	".tbz"     => "application/x-gtar-compressed",
-	".tar.bz2" => "application/x-gtar-compressed",
+	".tbz"     => "application/x-bzip-compressed-tar",
+	".tar.bz2" => "application/x-bzip-compressed-tar",
 	".bz2"     => "application/x-bzip2",
 	".log"     => "text/plain",
 	".conf"    => "text/plain",