Update docs to reflect new behavior of delete function taking array in second argument

README.markdown

@@ -148,7 +148,7 @@ strings; for example, 'hello\n' becomes 'hello'. Requires a single string or arr
   *Type*: rvalue
 
 * `delete`: Deletes all instances of a given element from an array, substring from a
-string, or key from a hash. For example, `delete(['a','b','c','b'], 'b')` returns ['a','c']; `delete('abracadabra', 'bra')` returns 'acada'. *Type*: rvalue
+string, or key from a hash. For example, `delete(['a','b','c','b'], 'b')` returns ['a','c']; `delete('abracadabra', 'bra')` returns 'acada'. `delete({'a' => 1,'b' => 2,'c' => 3},['b','c'])` returns {'a'=> 1} *Type*: rvalue
 
 * `delete_at`: Deletes a determined indexed value from an array. For example, `delete_at(['a','b','c'], 1)` returns ['a','c']. *Type*: rvalue
 

lib/puppet/parser/functions/delete.rb

@@ -17,6 +17,9 @@ string, or key from a hash.
     delete({'a'=>1,'b'=>2,'c'=>3}, 'b')
     Would return: {'a'=>1,'c'=>3}
 
+    delete({'a'=>1,'b'=>2,'c'=>3}, ['b','c'])
+    Would return: {'a'=>1}
+
     delete('abracadabra', 'bra')
     Would return: 'acada'
   EOS