[clang-tidy][docs] Fix link to libc style guide

clang-tools-extra/clang-tidy/llvmlibc/InlineFunctionDeclCheck.h

 #include "../FileExtensionsSet.h"
 
 namespace clang::tidy::llvm_libc {
 
 /// Checks that explicitly and implicitly inline functions in headers files
 /// are tagged with the LIBC_INLINE macro.
 ///
 /// For more information about the LIBC_INLINE macro, see
-/// https://libc.llvm.org/code_style.html.
+/// https://libc.llvm.org/dev/code_style.html.
 ///
 /// For the user-facing documentation see:
 /// http://clang.llvm.org/extra/clang-tidy/checks/llvmlibc/inline-function-decl-check.html
 class InlineFunctionDeclCheck : public ClangTidyCheck {
 public:
   InlineFunctionDeclCheck(StringRef Name, ClangTidyContext *Context);
 
   bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {

clang-tools-extra/docs/clang-tidy/checks/llvmlibc/inline-function-decl.rst

 .. title:: clang-tidy - llvmlibc-inline-function-decl
 
 llvmlibc-inline-function-decl
 =============================
 
 Checks that all implicit and explicit inline functions in header files are
 tagged with the ``LIBC_INLINE`` macro. See the `libc style guide
-<https://libc.llvm.org/code_style.html>`_ for more information about this macro.
+<https://libc.llvm.org/dev/code_style.html>`_ for more information about this macro.