[clang-tidy] Add cert-err09-cpp check alias.

[curdeius]

Summary

This adds cert-err09-cpp alias for completeness, similar to cert-err61-cpp.

[hokein]

LGTM, thanks.

clang-tidy/cert/CERTTidyModule.cpp

void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
     CheckFactories.registerCheck<misc::NewDeleteOverloadsCheck>(
         "cert-dcl54-cpp");
     CheckFactories.registerCheck<google::build::UnnamedNamespaceInHeaderCheck>(
         "cert-dcl59-cpp");
     // OOP
     CheckFactories.registerCheck<misc::MoveConstructorInitCheck>(
         "cert-oop11-cpp");
     // ERR
+    CheckFactories.registerCheck<misc::ThrowByValueCatchByReferenceCheck>(
+        "cert-err09-cpp");
     CheckFactories.registerCheck<SetLongJmpCheck>(
         "cert-err52-cpp");
     CheckFactories.registerCheck<StaticObjectExceptionCheck>(
         "cert-err58-cpp");
     CheckFactories.registerCheck<ThrownExceptionTypeCheck>(
         "cert-err60-cpp");
     CheckFactories.registerCheck<misc::ThrowByValueCatchByReferenceCheck>(
         "cert-err61-cpp");

docs/clang-tidy/checks/cert-err09-cpp.rst

+.. title:: clang-tidy - cert-err09-cpp
+.. meta::
+   :http-equiv=refresh: 5;URL=misc-throw-by-value-catch-by-reference.html
+
+cert-err09-cpp
+==============
+
+The cert-err09-cpp check is an alias, please see
+`misc-throw-by-value-catch-by-reference <misc-throw-by-value-catch-by-reference.html>`_
+for more information.

docs/clang-tidy/checks/list.rst

 .. title:: clang-tidy - Clang-Tidy Checks
 
 Clang-Tidy Checks
 =================
 
 .. toctree::
    boost-use-to-string
    cert-dcl03-c (redirects to misc-static-assert) <cert-dcl03-c>
    cert-dcl50-cpp
    cert-dcl54-cpp (redirects to misc-new-delete-overloads) <cert-dcl54-cpp>
    cert-dcl59-cpp (redirects to google-build-namespaces) <cert-dcl59-cpp>
    cert-env33-c
+   cert-err09-cpp (redirects to misc-throw-by-value-catch-by-reference) <cert-err09-cpp>
    cert-err34-c
    cert-err52-cpp
    cert-err58-cpp
    cert-err60-cpp
    cert-err61-cpp (redirects to misc-throw-by-value-catch-by-reference) <cert-err61-cpp>
    cert-fio38-c (redirects to misc-non-copyable-objects) <cert-fio38-c>
    cert-flp30-c
    cert-oop11-cpp (redirects to misc-move-constructor-init) <cert-oop11-cpp>

docs/clang-tidy/checks/misc-throw-by-value-catch-by-reference.rst

 .. title:: clang-tidy - misc-throw-by-value-catch-by-reference
 
 misc-throw-by-value-catch-by-reference
 ======================================
 
+"cert-err09-cpp" redirects here as an alias for this check.
 "cert-err61-cpp" redirects here as an alias for this check.
 
 Finds violations of the rule "Throw by value, catch by reference" presented for
 example in "C++ Coding Standards" by H. Sutter and A. Alexandrescu.
 
 Exceptions:
   * Throwing string literals will not be flagged despite being a pointer. They
     are not susceptible to slicing and the usage of string literals is idomatic.