Fix comment typos, strip trailing whitespace. Patch from STL@microsoft.com

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@273357 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/strings/char.traits/char.traits.specializations/char.traits.specializations.char/lt.pass.cpp

@@ -24,7 +24,7 @@ int main()
 	assert(!std::char_traits<char>::lt('a', 'a'));
 	assert( std::char_traits<char>::lt('A', 'a'));
 	assert(!std::char_traits<char>::lt('a', 'A'));
-	
+
 	assert( std::char_traits<char>::lt('a', 'z'));
 	assert( std::char_traits<char>::lt('A', 'Z'));
 

test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_swappable_with.pass.cpp

@@ -74,7 +74,7 @@ int main()
 
     }
     {
-        // test for presense of is_nothrow_swappable_with_v
+        // test for presence of is_nothrow_swappable_with_v
         static_assert(std::is_nothrow_swappable_with_v<int&, int&>, "");
         static_assert(!std::is_nothrow_swappable_with_v<int&&, int&&>, "");
     }

test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable.pass.cpp

@@ -70,7 +70,7 @@ int main()
         static_assert(!std::is_swappable<int() &>::value, "");
     }
     {
-        // test for presense of is_swappable_v
+        // test for presence of is_swappable_v
         static_assert(std::is_swappable_v<int>, "");
         static_assert(!std::is_swappable_v<M>, "");
     }

test/std/utilities/meta/meta.unary/meta.unary.prop/is_swappable_with.pass.cpp

@@ -65,7 +65,7 @@ int main()
         static_assert(!std::is_swappable_with<D&, C&>::value, "");
     }
     {
-        // test that cv void  is guarded against as required.
+        // test that cv void is guarded against as required.
         static_assert(!std::is_swappable_with_v<void, int>, "");
         static_assert(!std::is_swappable_with_v<int, void>, "");
         static_assert(!std::is_swappable_with_v<const void, const volatile void>, "");

test/std/utilities/tuple/tuple.general/tuple.smartptr.pass.cpp

@@ -29,5 +29,5 @@ int main () {
     }
     // 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 move information.
-}
+    // See http://reviews.llvm.org/D21320 for more information.
+}