Updated CHANGELOG.md, man page and made alias visible in fd -h too

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Features
 
+- Add `dir` as an alias to `directory` when using `-t` \ `--type`, see #1460 and #1464 (@Ato2207).
 
 ## Bugfixes
 

doc/fd.1

@@ -191,7 +191,7 @@ Filter search by type:
 .RS
 .IP "f, file"
 regular files
-.IP "d, directory"
+.IP "d, dir, directory"
 directories
 .IP "l, symlink"
 symbolic links

src/cli.rs

@@ -352,7 +352,7 @@ pub struct Opts {
         value_name = "filetype",
         hide_possible_values = true,
         value_enum,
-        help = "Filter by type: file (f), directory (d), symlink (l), \
+        help = "Filter by type: file (f), directory (d/dir), symlink (l), \
                 executable (x), empty (e), socket (s), pipe (p), \
                 char-device (c), block-device (b)",
         long_help