[io grant] Remove IO::Path.chdir prose

Will write new info after fixing up the method in Rakudo.

- &chdir is vastly different and shouldn't be listed together
- the prose is wrong, IO::Path.chdir doesn't use $*CWD
- the prose mentions now-deprecated :test param

Author: zoffixznet

doc/Type/IO/Path.pod6

@@ -329,24 +329,9 @@ Write C<$contents> to this path, like L<spurt|/routine/spurt>.
 
 =head2 routine chdir
 
-    sub chdir(Str() $path, :$test = 'r' --> IO::Path)
     multi method chdir(IO::Path:U: $path, :$test = 'r' --> IO::Path)
     multi method chdir(IO::Path:D: Str() $path is copy, :$test = 'r' --> IO::Path)
 
-Alter the process' notion of the current working directory (as found in
-C<$*CWD>).
-
-The subroutine and class method forms both change the directory relative to
-C<$*CWD> if the supplied C<$path> is not absolute.  The object method form
-changes the directory relative to the path of the invocant if C<$path> is
-not absolute.  The optional named parameter C<test> can specify a file test
-that should be applied to the target path if the operation is successful.
-The default C<test> is that the directory is readable.
-
-If the directory change is successful then the L<IO::Path>
-representing the target directory is returned, otherwise it will
-L<fail|/routine/fail> with L<X::IO::Chdir>.
-
 =head2 routine mkdir
 
     multi sub mkdir(Int:D $mode, *@dirnames --> List)