[clang-tidy][docs] Fix wrong url in DontModifyStdNamespaceCheck

[steakhal]

Summary

It was probably a copy-paste mistake.
The check was added as cert-dcl58-cpp, so the doc should point there.

[aaron.ballman]

LGTM!

clang-tools-extra/clang-tidy/cert/DontModifyStdNamespaceCheck.h

 namespace clang {
 namespace tidy {
 namespace cert {
 
 /// Modification of the std or posix namespace can result in undefined behavior.
 /// This check warns for such modifications.
 ///
 /// For the user-facing documentation see:
-/// http://clang.llvm.org/extra/clang-tidy/checks/cert-msc53-cpp.html
+/// https://clang.llvm.org/extra/clang-tidy/checks/cert-dcl58-cpp.html
 class DontModifyStdNamespaceCheck : public ClangTidyCheck {
 public:
   DontModifyStdNamespaceCheck(StringRef Name, ClangTidyContext *Context)
       : ClangTidyCheck(Name, Context) {}
   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
     return LangOpts.CPlusPlus;
   }
   void registerMatchers(ast_matchers::MatchFinder *Finder) override;
   void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
 };
 
 } // namespace cert
 } // namespace tidy
 } // namespace clang
 
 #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CERT_DONT_MODIFY_STD_NAMESPACE_H