[libcxx] [test] Fix URLs in comments and make them HTTPS. NFC.

llvm-svn: 310156
diff --git a/libcxx/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp b/libcxx/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp
index d1b974c..811dfc0 100644
--- a/libcxx/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp
+++ b/libcxx/test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp
@@ -29,5 +29,5 @@
     }
     // Smart pointers of type 'T[N]' are not tested here since they are not
     // supported by the standard nor by libc++'s implementation.
-    // See http://reviews.llvm.org/D21320 for more information.
+    // See https://reviews.llvm.org/D21320 for more information.
 }