[dartdev] tweak the help text for dartdev analytics
[dartdev] tweak the help text for dartdev analytics

Change-Id: I4beefb06a1bc21b830b3061d4d9d3d8162f85593
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174323
Reviewed-by: Ben Konyi <67ffcaedcc3dc3d87dddb9627b72dd41756b31b1@google.com>
Commit-Queue: Devon Carew <e996497f4f2225f0ee7a9f4d1696ee710b488b66@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk