Fix some mistakes in the <utility> and <tuple> synopses. No functional change. Thannks to K-ballo for the patch

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@253593 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/utility b/include/utility
index 2975320..d476c6b 100644
--- a/include/utility
+++ b/include/utility
@@ -113,7 +113,7 @@
     get(pair<T1, T2>&) noexcept; // constexpr in C++14
 
 template<size_t I, class T1, class T2>
-    const typename const tuple_element<I, pair<T1, T2> >::type&
+    const typename tuple_element<I, pair<T1, T2> >::type&
     get(const pair<T1, T2>&) noexcept; // constexpr in C++14
 
 template<size_t I, class T1, class T2>
@@ -124,7 +124,7 @@
     constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
 
 template<size_t I, class T1, class T2>
-    constexpr T1 const& get(pair<T1, T2> const &) noexcept; // C++14
+    constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14
 
 template<size_t I, class T1, class T2>
     constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14