Minor consitency and comment tweaks

include/fmt/core.h

@@ -317,9 +317,9 @@ FMT_BEGIN_NAMESPACE
 FMT_MODULE_EXPORT_BEGIN
 
 // Implementations of enable_if_t and other metafunctions for older systems.
-template <bool B, class T = void>
+template <bool B, typename T = void>
 using enable_if_t = typename std::enable_if<B, T>::type;
-template <bool B, class T, class F>
+template <bool B, typename T, typename F>
 using conditional_t = typename std::conditional<B, T, F>::type;
 template <bool B> using bool_constant = std::integral_constant<bool, B>;
 template <typename T>
@@ -333,11 +333,10 @@ struct monostate {
   constexpr monostate() {}
 };
 
-// Eliminate "unused variable" warnings on all compilers.  The
-// `(void)var` method does not work on many intel compilers.  This is
-// from Herb Sutter, "Shutting up compiler warnings",
-// https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/
-template <class... Ts> FMT_CONSTEXPR void ignore_unused(const Ts&...) {}
+// Suppress "unused variable" warnings with the method described in
+// https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/.
+// (void)var does not work on many Intel compilers.
+template <typename... T> FMT_CONSTEXPR void ignore_unused(const T&...) {}
 
 // An enable_if helper to be used in template parameters which results in much
 // shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed