[libcxx][NFC] Strip trailing whitespace, fix typo.

Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 7c9844b66e5e0cca1424e0688b4384d4ec23325a
diff --git a/src/chrono.cpp b/src/chrono.cpp
index c461d19..2d78cae 100644
--- a/src/chrono.cpp
+++ b/src/chrono.cpp
@@ -183,7 +183,7 @@
 
 // https://msdn.microsoft.com/en-us/library/windows/desktop/ms644905(v=vs.85).aspx says:
 //    If the function fails, the return value is zero. <snip>
-//    On systems that run Windows XP or later, the function will always succeed 
+//    On systems that run Windows XP or later, the function will always succeed
 //      and will thus never return zero.
 
 static LARGE_INTEGER