Mention :delete and :exists on hashes in 5to6

lib/Language/5to6.pod

@@ -208,6 +208,23 @@ I<Key/value-slicing an array variable>
     say join ',', @months[6, 8..11]:kv; # Perl 6 - % becomes @; slice controlled by adverb
 =end item
 
+Some functions for manipulating hashes and querying hash values have been
+turned into adverbs:
+
+=begin item
+I<Checking for element existence in a hash>
+
+    say "element exists" if exists $hash{$key};  # Perl 5
+    say "element exists" if %hash{$key}:exists;  # Perl 6 - exists controlled by adverb
+=end item
+
+=begin item
+I<Deleting an element in a hash>
+
+    my $deleted_value = delete $hash{$key};  # Perl 5
+    my $deleted_value = %hash{$key}:delete;  # Perl 6 - delete controlled by adverb
+=end item
+
 =head4 C<&> Sub
 
 In Perl 6, the C<&> sigil is used consistently (and without the help of