update_engine: fixed remaining linter and some spelling errors

Fixed remaining errors from cpplint as well as some spelling errors
mostly in comments.

BUG=None
TEST=FEATURES=test emerge-link update_engine

Change-Id: I484988ab846ac5a3c68c016ddccfb247f225ec27
Reviewed-on: https://chromium-review.googlesource.com/208897
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/update_manager/update_manager_unittest.cc b/update_manager/update_manager_unittest.cc
index 7040a34..8f81be5 100644
--- a/update_manager/update_manager_unittest.cc
+++ b/update_manager/update_manager_unittest.cc
@@ -106,7 +106,7 @@
 
 // A policy that sleeps and returns EvalStatus::kAskMeAgainlater. Will check
 // that time is greater than a given threshold (if non-zero). Increments a
-// counter every time it is being querie, if a pointer to it is provided.
+// counter every time it is being queried, if a pointer to it is provided.
 class DelayPolicy : public DefaultPolicy {
  public:
   DelayPolicy(int sleep_secs, base::Time time_threshold, int* num_called_p)