Fixed TestAccComputeRegionNetworkEndpointGroup_regionNetworkEndpointGroupAppengineExample (#4761) (#140)
Fixed TestAccComputeRegionNetworkEndpointGroup_regionNetworkEndpointGroupAppengineExample (#4761) (#140)

* Switched app name to not use default

* Added note re: allowed characters to service field

Signed-off-by: Modular Magician <86ce7da8ad74b1c583667a2bebd347455fa06219@google.com>
terraform-google-modules/docs-examples