Fixes word-variants refs #3024

Author: JJ

doc/Type/Metamodel/ClassHOW.pod6

@@ -29,7 +29,7 @@
         does Metamodel::Finalization
             { }
 
-C<Metamodel::ClassHOW> is the meta class behind the C<class> keyword.
+C<Metamodel::ClassHOW> is the metaclass behind the C<class> keyword.
 
     say so Int.HOW ~~ Metamodel::ClassHOW;    # OUTPUT: «True␤»
     say Int.^methods(:all).pick.name;         # OUTPUT: «random Int method name␤»
@@ -58,7 +58,7 @@ If C<$condition> returns a false value, the
 next fallback (if any) is tried, and if none matches, an exception
 L<of type X::Method::NotFound|/type/X::Method::NotFound> is thrown.
 
-User-facing code (that is, code not dabbling with meta classes) should use
+User-facing code (that is, code not dabbling with metaclasses) should use
 method C<FALLBACK> instead.
 
 =head2 method can
@@ -105,7 +105,7 @@ not provide a full list of all candidates.
 
       method compose(Metamodel::ClassHOW:D: $obj)
 
-A call to C<compose> brings the meta object and thus the class it represents
+A call to C<compose> brings the metaobject and thus the class it represents
 into a fully functional state, so if you construct or modify a class, you must
 call the compose method before working with the class.