Docs about Cloudwatch log group in "Monitoring Runtime Logging" incorrect.

[jamestelfer]

In resource-type-develop.md, the section Monitoring Runtime Logging for Resource Types contains incorrect information:

1. The group is not created by Cloudformation during cfn submit
2. The naming scheme for the log group is incorrect

I think the corrected text would state that (a) the group is created by the Cloudformation runtime when the resource is first run, and (b) the naming scheme is my-resource-type-logs, where my-resource-type is the three-part resource type name.

Also, it could be noted that each plugin has varying requirements for logging to be emitted. For example, the Go plugin requires a build argument to enable it (see https://github.com/aws-cloudformation/cloudformation-cli-go-plugin/issues/187).

[jamestelfer]

If the above is correct, I can raise a PR for it: LMK.