Make class type declaration context independent

Closes GH-316

Author: Girgias

language/types/declarations.xml

@@ -42,8 +42,8 @@
      <row>
       <entry><type>self</type></entry>
       <entry>
-       The value must be an &instanceof; the same class as the one the
-       method is defined on.
+       The value must be an &instanceof; the same class as the one
+       in which the type declaration is used.
        Can only be used in classes.
       </entry>
       <entry/>
@@ -52,7 +52,7 @@
       <entry><type>parent</type></entry>
       <entry>
        The value must be an &instanceof; the parent of the class
-       in which the property is defined.
+       in which the type declaration is used.
        Can only be used in classes.
       </entry>
       <entry/>