[NFC] Fix typo in <tuple>

llvm-svn: 346629
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: d9247890da49921c5b117123c27e6e2d937818eb
diff --git a/include/tuple b/include/tuple
index fb5428e..766f2e3 100644
--- a/include/tuple
+++ b/include/tuple
@@ -65,7 +65,7 @@
     template <class U1, class U2>
         tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2
     template <class U1, class U2>
-        tuple& operator=(pair<U1, U2>&&); //iffsizeof...(T) == 2
+        tuple& operator=(pair<U1, U2>&&); // iff sizeof...(T) == 2
 
     void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...));
 };