Update QList::append(const_reference) -> QList::append(parameter_type)

Forgotten during previous round of replacing const lvalue references
with parameter_type in QList methods

Task-number: QTBUG-86553
Change-Id: I9abda4db3b504521b64fab1f220559c36bfeb9f5
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qlist.h

@@ -272,7 +272,7 @@ public:
         return data()[i];
     }
     const_reference operator[](qsizetype i) const noexcept { return at(i); }
-    void append(const_reference t)
+    void append(parameter_type t)
     { append(const_iterator(std::addressof(t)), const_iterator(std::addressof(t)) + 1); }
     void append(const_iterator i1, const_iterator i2);
     void append(rvalue_ref t) { emplaceBack(std::move(t)); }

src/corelib/tools/qlist.qdoc

@@ -637,7 +637,7 @@
 */
 
 /*!
-    \fn template <typename T> void QList<T>::append(const_reference value)
+    \fn template <typename T> void QList<T>::append(parameter_type value)
 
     Inserts \a value at the end of the list.