IO::Path: restructure the file test operator section.

Update examples, reference .path.

doc/Type/IO/Path.pod6

@@ -571,23 +571,10 @@ my $perl-files = gather while @stack {
 For most file tests, you can do a smartmatch C<~~> or you can call a method.
 You don't need to actually open a filehandle in the traditional way (although
 you can) to do a filetest. You can simply append C<.IO> to the filename. For
-instance, here is how to check if a file is readable using smartmatch:
+instance, here is how to check whether a file is readable using smartmatch:
 
     '/path/to/file'.IO ~~ :r;
 
-L«Smartmatching on Pairs|/type/Pair#method_ACCEPTS» is useful for performing
-multiple file tests:
-
-    say :d & :x;                # OUTPUT: «all(d => True, x => True)␤»
-    say '/tmp'.IO ~~ :d & :x;   # OUTPUT: «True␤»
-    say '/'.IO    ~~ :d & :rw;  # OUTPUT: «False␤»
-
-You can, of course, use an already opened filehandle. Here, using the filehandle
-C<$fh>, is an example, using the method syntax for the file test:
-
-=for code :preamble<my $fh>
-$fh.r
-
 File tests include:
 
 =item C<:d> (L«Directory|/type/IO::Path#method_d»)
@@ -602,13 +589,23 @@ File tests include:
 =item C<:x> (L«Executable|/type/IO::Path#method_x»)
 =item C<:z> (L«Zero size|/type/IO::Path#method_z»)
 
-All of these tests can be used as methods (without the colon).
-Three tests, however exist only as methods:
+L«Smartmatching on Pairs|/type/Pair#method_ACCEPTS» can be used to perform
+multiple tests at once:
+
+    say :d & :x;                # OUTPUT: «all(d => True, x => True)␤»
+    say '/tmp'.IO ~~ :d & :x;   # OUTPUT: «True␤»
+    say '/'.IO    ~~ :d & :rw;  # OUTPUT: «False␤»
+
+All of the above tests can be used as methods (without the colon), though method tests
+may throw C<X::IO::DoesNotExist> as documented below.  Three tests only exist as methods:
+L«C<accessed>|#method_accessed», L«C<changed>|#method_changed» and L«C<modified>|#method_modified».
+
+You can also perform file tests on an already opened filehandle by testing against its
+L«C<.path>|/type/IO::Handle#method_path» method. For example, given filehandle C<$fh>:
 
 =for code :preamble<my $fh>
-$fh.modified;
-$fh.accessed;
-$fh.changed;
+$fh.path ~~ :r;
+$fh.path.r;       # method form
 
 =head2 method e