shiboken6/Documentation: Fix wrong code snippets

The snippets for the method call are flipped.

Pick-to: 6.9 6.8
Change-Id: I8b571c51d6d82391f4bcfca45fd3f9892bfb688a
Reviewed-by: Cristian Maureira-Fredes <[email protected]>
Reviewed-by: Ece Cinucen <[email protected]>

Author: FriedemannKleint

sources/shiboken6/doc/typesystem_codeinjection.rst

@@ -177,7 +177,7 @@ In other words, use
 .. code-block:: xml
 
      <inject-code class="target" position="beginning | end">
-         %CPPSELF.originalMethodName();
+         %CPPSELF.%FUNCTION_NAME();
      </inject-code>
 
 
@@ -187,7 +187,7 @@ instead of
 .. code-block:: xml
 
      <inject-code class="target" position="beginning | end">
-        %CPPSELF.%FUNCTION_NAME();
+        %CPPSELF.originalMethodName();
      </inject-code>