C++: fix QL4QL warnings

Author: rdmarsh2

cpp/ql/lib/semmle/code/cpp/ir/implementation/raw/internal/TranslatedElement.qll

@@ -947,7 +947,7 @@ abstract class TranslatedElement extends TTranslatedElement {
 }
 
 /**
- * Represents the IR translation of a root element, either a function or a global variable.
+ * The IR translation of a root element, either a function or a global variable.
  */
 abstract class TranslatedRootElement extends TranslatedElement {
   TranslatedRootElement() {

cpp/ql/lib/semmle/code/cpp/ir/implementation/raw/internal/TranslatedGlobalVar.qll

@@ -65,7 +65,7 @@ class TranslatedGlobalOrNamespaceVarInit extends TranslatedRootElement,
       result = this.getInstruction(InitializerVariableAddressTag())
       or
       tag = InitializerVariableAddressTag() and
-      result = getChild(1).getFirstInstruction()
+      result = this.getChild(1).getFirstInstruction()
       or
       tag = ReturnTag() and
       result = this.getInstruction(AliasedUseTag())