[Turbofan] Typo in turbo-stats flag

Simple typo fixed.

Bug: 
Change-Id: I958e384490db02008765408bc825345d350586b2
Reviewed-on: https://chromium-review.googlesource.com/614340Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Alexandre Talon <alexandret@google.com>
Cr-Commit-Position: refs/heads/master@{#47358}

src/compilation-statistics.cc

@@ -100,7 +100,7 @@ static void WriteFullLine(std::ostream& os) {
 
 static void WriteHeader(std::ostream& os) {
   WriteFullLine(os);
-  os << "             Turbonfan phase        Time (ms)             "
+  os << "             Turbofan phase         Time (ms)             "
      << "          Space (bytes)             Function\n"
      << "                                                         "
      << "  Total          Max.     Abs. max.\n";