IO::FileTestable: link anchors, mention method form

lib/Type/IO/FileTestable.pod

@@ -10,13 +10,19 @@
 
 =head2 File Test operators
 
+X<-e> X<:-f>
+
     -e
     -f Does not exist in Perl 6. See :e, :f.
 
+X<-M> X<-A> X<-C>
+
     -M Does not exist in Perl 6. See C<modified>.
     -A Does not exist in Perl 6. See C<accessed>.
     -C Does not exist in Perl 6. See C<changed>.
 
+X<:e> X<:d> X<:f> X<:l> X<:r> X<:w> X<:x> X<:s> X<:z>
+
     :e Exists
     :d Directory
     :f File
@@ -40,6 +46,12 @@ If you have a string - a path to something in the filesystem:
         say 'file exists';
     }
 
+Instead of the colonpair syntax, you can use method calls too:
+
+    if 'path/to/file'.IO.e {
+        say 'file exists';
+    }
+
 If you already have an IO object in $file, either by creating one yourself,
 or by getting it from another subroutine, such as C<dir>,
 you can write this: