[Autofill Assistant] Fix typo in enums.xml

Bug: none
Change-Id: I63f5c2f559ef0deb5169c64f6c99b24afab57393
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315028
Auto-Submit: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791226}

tools/metrics/histograms/enums.xml

@@ -4295,7 +4295,7 @@ Unknown properties are collapsed to zero. -->
   <int value="21" label="User navigation to a different domain in BROWSE mode"/>
   <int value="22" label="User clicked back button"/>
   <int value="23" label="User clicked back button during onboarding"/>
-  <int value="24" label="User navigatioin in RUNNING state"/>
+  <int value="24" label="User navigation in RUNNING state"/>
   <int value="25" label="The UI was closed unexpectedly"/>
 </enum>