Update index.ngdoc fix grammar

Update index.ngdoc to fix grammar for parallelism. Expressions separated by commas should be structured similarly, and in this case the verbs of each of those expressions refer to "catalog". The catalog does not view details, but presents them.

BEFORE: "... catalog that displays a list of Android devices, lets you filter the list to see only devices that interest you, and then view details..."
AFTER: "... catalog that displays a list of Android devices, lets you filter the list to see only devices that interest you, and then presents details..."