[docs][NewPM] fix typos in new pass manager docs

[AlexM]

Summary

Fix some minor errors in the code-block sections of the new pass manager documentation

[AlexM]

I spotted these errors while working through the docs. This is my first LLVM code review so apologies for any errors I've made in following the process. Thanks!

llvm/docs/NewPassManager.rst

.. code-block:: c++
 
   ModulePassManager MPM;
   // loop -> function -> module
   MPM.addPass(createModuleToFunctionPassAdaptor(createFunctionToLoopPassAdaptor(LoopFooPass())));
   // function -> module
   MPM.addPass(createModuleToFunctionPassAdaptor(FunctionFooPass()));
 
   // loop -> function -> cgscc -> module
-  MPM.addPass(createModuleToCGSCCPassAdaptor(createCGSCCToFunctionPassAdaptor(createFunctionToLoopPassAdaptor(LoopFooPass()))));
+  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(createCGSCCToFunctionPassAdaptor(createFunctionToLoopPassAdaptor(LoopFooPass()))));
   // function -> cgscc -> module
-  MPM.addPass(createModuleToCGSCCPassAdaptor(createCGSCCToFunctionPassAdaptor(FunctionFooPass())));
+  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(createCGSCCToFunctionPassAdaptor(FunctionFooPass())));
 
 
 A pass manager of a specific IR unit is also a pass of that kind. For
 example, a ``FunctionPassManager`` is a function pass, meaning it can be
 added to a ``ModulePassManager``:
 
 .. code-block:: c++
 
.. code-block:: c++
   }
 
 If an analysis depends on other analyses, those analyses also need to be
 checked if they are invalidated:
 
 .. code-block:: c++
 
   bool FooAnalysisResult::invalidate(Function &F, const PreservedAnalyses &PA,
-                                     FunctionAnalysisManager::Invalidator &) {
+                                     FunctionAnalysisManager::Invalidator &Inv) {
     auto PAC = PA.getChecker<FooAnalysis>();
     if (!PAC.preserved() && !PAC.preservedSet<AllAnalysesOn<Function>>())
       return true;
 
     // Check transitive dependencies.
     return Inv.invalidate<BarAnalysis>(F, PA) ||
           Inv.invalidate<BazAnalysis>(F, PA);
   }