Fix Typos in User Actions README

Follow-up from https://chromium-review.googlesource.com/c/chromium/src/+/2392712/2

Change-Id: I7642e72fbe75f8b31f19bc34f10cbbb60201e81a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404571
Auto-Submit: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805966}

tools/metrics/actions/README.md

@@ -186,8 +186,8 @@ somebody familiar with the user action notices and triages such bugs!
 
 actions.xml allows you to annotate an action as `not_user_triggered="true"`.
 Use it when appropriate.  For example, showing a notification is not user
-triggered.  However, please remember: before adding something marked as
-`not_user_triggered="true"`, consider when you need to analyze sequences of
+triggered.  However, please remember: Before adding something marked as
+`not_user_triggered="true"`, consider whether you need to analyze sequences of
 actions.  If not, please use a histogram to count these events instead.
 
 ## Cleaning Up User Action Entries