[NFC] fix trivial typos in comments and documents

"to to" -> "to"

llvm-svn: 323628
diff --git a/llvm/utils/unittest/googletest/src/gtest-port.cc b/llvm/utils/unittest/googletest/src/gtest-port.cc
index e5bf3dd..6aeef49 100644
--- a/llvm/utils/unittest/googletest/src/gtest-port.cc
+++ b/llvm/utils/unittest/googletest/src/gtest-port.cc
@@ -496,7 +496,7 @@
                                  FALSE,
                                  thread_id);
     GTEST_CHECK_(thread != NULL);
-    // We need to to pass a valid thread ID pointer into CreateThread for it
+    // We need to pass a valid thread ID pointer into CreateThread for it
     // to work correctly under Win98.
     DWORD watcher_thread_id;
     HANDLE watcher_thread = ::CreateThread(