[clang] [analyzer][NFC] Document and centralize the CallEvent argument/parameter index mapping (PR #221252)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/include/clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h clang/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h clang/lib/StaticAnalyzer/Core/CallEvent.cpp clang/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
index 6a8bf3d57..e1cf5f8a1 100644
--- a/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/clang/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -188,8 +188,9 @@ const StackFrame *CallEvent::getCalleeStackFrame(unsigned BlockCount) const {
   return ADC->getStackFrame(SF, nullptr, E, B, BlockCount, Idx);
 }
 
-const ParamVarRegion
-*CallEvent::getParameterLocation(std::optional<unsigned> Index, unsigned BlockCount) const {
+const ParamVarRegion *
+CallEvent::getParameterLocation(std::optional<unsigned> Index,
+                                unsigned BlockCount) const {
   if (!Index)
     return nullptr;
 

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https://github.com/llvm/llvm-project/pull/221252