Fix an Event typo and update an event.

Bug: 888885
Change-Id: Ic5b8f4decbfb5508cc52bb7d3f4540d41bcdb185
Reviewed-on: https://chromium-review.googlesource.com/c/1312145
Commit-Queue: Leo Zhang <googleo@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605252}

tools/metrics/histograms/enums.xml

@@ -25641,11 +25641,11 @@ Called by update_gpu_driver_bug_workaround_entries.py.-->
 
 <enum name="IMEExtensionMojoEvent">
   <int value="0" label="Unknown"/>
-  <int value="1" label="Init Sucess"/>
+  <int value="1" label="Init Success"/>
   <int value="2" label="Init Failed"/>
   <int value="3" label="Activate IME Success"/>
   <int value="4" label="Activate IME Failed"/>
-  <int value="5" label="Rulebased Process Failed"/>
+  <int value="5" label="Service disconnected"/>
 </enum>
 
 <enum name="IMEGestureTypingEvent">