message: docs(service-worker): mention that dataGroups only cache non-mutating requests
  Fixes
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diff: @@ -137,8 +137,9 @@ export interface DataGroup {
  Similar to `assetGroups`, every data group has a `name` which uniquely identifies it.
  ### `urls`
  -A list of URL patterns. URLs that match these patterns will be cached according to this data group's policy.<br>
  - _(Negative glob patterns are not supported and `?` will be matched literally; i.e. it will not match any character other than `?`.)_
  +A list of URL patterns. URLs that match these patterns are cached according to this data group's policy. Only non-mutating requests (GET and HEAD) are cached.
  + * Negative glob patterns are not supported.
  + * `?` is matched literally; that is, it matches *only* the character `?`.
  ### `version`
  Occasionally APIs change formats in a way that is not backward-compatible. A new version of the app may not be compatible with the old API format and thus may not be compatible with existing cached resources from that API.
  