code: public ShareSheetStyle includeInShareSheet(@NonNull String[] packageName) {
          includeInShareSheet.addAll(Arrays.asList(packageName));
          return this;
      }
docs: Include items from the ShareSheet by package name Array. If only "com.Slack"
  is included, then only preferred sharing options + Slack
  will be displayed, for example.
  
  @param packageName {@link String[]} package name to be included.
  @return this Builder object to allow for chaining of calls to set methods.