[libcxx] [test] Fix comment typos, strip trailing whitespace.

No functional change, no code review.

llvm-svn: 292434
diff --git a/libcxx/test/std/containers/sequences/array/at.pass.cpp b/libcxx/test/std/containers/sequences/array/at.pass.cpp
index 8e7ff6d..efec4e4 100644
--- a/libcxx/test/std/containers/sequences/array/at.pass.cpp
+++ b/libcxx/test/std/containers/sequences/array/at.pass.cpp
@@ -25,7 +25,7 @@
 
 #if TEST_STD_VER > 14
 constexpr bool check_idx( size_t idx, double val )
-{ 
+{
     std::array<double, 3> arr = {1, 2, 3.5};
 	return arr.at(idx) == val;
 }
diff --git a/libcxx/test/std/containers/sequences/array/front_back.pass.cpp b/libcxx/test/std/containers/sequences/array/front_back.pass.cpp
index 239fda5..68fc6cd 100644
--- a/libcxx/test/std/containers/sequences/array/front_back.pass.cpp
+++ b/libcxx/test/std/containers/sequences/array/front_back.pass.cpp
@@ -25,13 +25,13 @@
 
 #if TEST_STD_VER > 14
 constexpr bool check_front( double val )
-{ 
+{
     std::array<double, 3> arr = {1, 2, 3.5};
 	return arr.front() == val;
 }
 
 constexpr bool check_back( double val )
-{ 
+{
     std::array<double, 3> arr = {1, 2, 3.5};
 	return arr.back() == val;
 }
diff --git a/libcxx/test/std/containers/sequences/array/indexing.pass.cpp b/libcxx/test/std/containers/sequences/array/indexing.pass.cpp
index 6cb7941..3a5b9ee 100644
--- a/libcxx/test/std/containers/sequences/array/indexing.pass.cpp
+++ b/libcxx/test/std/containers/sequences/array/indexing.pass.cpp
@@ -25,7 +25,7 @@
 
 #if TEST_STD_VER > 14
 constexpr bool check_idx( size_t idx, double val )
-{ 
+{
     std::array<double, 3> arr = {1, 2, 3.5};
 	return arr[idx] == val;
 }
diff --git a/libcxx/test/std/containers/sequences/list/incomplete_type.pass.cpp b/libcxx/test/std/containers/sequences/list/incomplete_type.pass.cpp
index adfb4d4..aff8f03 100644
--- a/libcxx/test/std/containers/sequences/list/incomplete_type.pass.cpp
+++ b/libcxx/test/std/containers/sequences/list/incomplete_type.pass.cpp
@@ -9,7 +9,7 @@
 
 // <list>
 
-// Check that std::list and it's iterators can be instantiated with an incomplete
+// Check that std::list and its iterators can be instantiated with an incomplete
 // type.
 
 #include <list>