Fixed syntax and vocabulary on comments relative to betterInstanceOf

- in modules/tester.js
- in modules/utils.js
and BTW in their documentations

@@ -450,7 +450,7 @@ Asserts that the provided input is of the given type::
 ``assertInstanceOf()``
 -------------------------------------------------------------------------------
 
-**Signature:** ``assertInstanceOf(mixed input, function constructor[, String message])``
+**Signature:** ``assertInstanceOf(mixed input, Function constructor[, String message])``
 
 Asserts that the provided input is of the given constructor::
     

@@ -29,7 +29,7 @@ Provides a better ``typeof`` operator equivalent, eg. able to retrieve the ``Arr
 
 **Signature:** ``betterInstanceOf(input, constructor)``
 
-Provides a better ``instanceof`` operator equivalent, eg. able to retrieve the ``Array`` type or to deal with inheritance.
+Provides a better ``instanceof`` operator equivalent, is able to retrieve the ``Array`` instance or to deal with inheritance.
 
 .. index:: dump, Serialization, Debugging, JSON
 

@@ -840,10 +840,10 @@ Tester.prototype.assertType = function assertType(subject, type, message) {
 };
 
 /**
- * Asserts that the provided subject is of the given class.
+ * Asserts that the provided subject has the provided constructor in its prototype hierarchy.
  *
  * @param  mixed   subject       The value to test
- * @param  function constructor  The javascript type name
+ * @param  Function constructor  The javascript type name
  * @param  String  message       Test description
  * @return Object                An assertion result object
  */
@@ -857,7 +857,7 @@ Tester.prototype.assertInstanceOf = function assertInstanceOf(subject, construct
         standard: f('Subject is instance of: "%s"', constructor.name),
         values: {
             subject: subject,
-            className: constructor.name,
+            constructor: constructor.name,
         }
     });
 };

@@ -71,8 +71,7 @@ function betterTypeOf(input) {
 exports.betterTypeOf = betterTypeOf;
 
 /**
- * Provides a better instanceof operator equivalent, able to retrieve the uninstantiated string
- * or inheritance cases.
+ * Provides a better instanceof operator, capable of checking against the full object prototype hierarchy.
  *
  * @param  mixed  input
  * @param  function constructor