message: Fixed typos in Log.h
  Patch by: Yuya Fujita
diff: @@ -69,7 +69,7 @@ public:
  : log_ptr(nullptr), categories(categories),
  default_flags(default_flags) {}
  - // This function is safe to call at any time If the channel is disabled
  + // This function is safe to call at any time. If the channel is disabled
  // after (or concurrently with) this function returning a non-null Log
  // pointer, it is still safe to attempt to write to the Log object -- the
  // output will be discarded.
  @@ -80,7 +80,7 @@ public:
  return nullptr;
  }
  - // This function is safe to call at any time If the channel is disabled
  + // This function is safe to call at any time. If the channel is disabled
  // after (or concurrently with) this function returning a non-null Log
  // pointer, it is still safe to attempt to write to the Log object -- the
  // output will be discarded.
  