Minor comment tweak

Author: vitaut

include/fmt/base.h

@@ -327,8 +327,7 @@ template <typename T> using decay_t = typename std::decay<T>::type;
 using nullptr_t = decltype(nullptr);
 
 #if (FMT_GCC_VERSION && FMT_GCC_VERSION < 500) || FMT_MSC_VERSION
-// A workaround for gcc 4.9 and MSVC v141 to make void_t work in a SFINAE
-// context.
+// A workaround for gcc 4.9 & MSVC v141 to make void_t work in a SFINAE context.
 template <typename...> struct void_t_impl {
   using type = void;
 };