[io grant] Document IO::Path.cleanup

Author: zoffixznet

doc/Type/IO/Path.pod6

@@ -143,6 +143,22 @@ paths and is also slower, since it has to do more work. Use
 L«C<.add>|/routine/add» if your code does not need to guarantee the added
 path is in fact a child path.
 
+=head2 method cleanup
+
+Defined as:
+
+    method cleanup(IO::Path:D: --> IO::Path:D)
+
+Returns a new path that is a canonical representation of the invocant path,
+cleaning up any extraneous path parts:
+
+    "foo/./././..////bar".IO.cleanup.say;      # OUTPUT: «"foo/../bar".IO␤»
+    IO::Path::Win32.new("foo/./././..////bar")
+        .cleanup.say; "foo\..\bar".IO;         # OUTPUT: «"foo\\..\\bar".IO␤»
+
+Note that no file system access is made. See also
+L«C<resolve>|/routine/resolve».
+
 =head2 method extension
 
 Defined as: