All READMEs for the Google Maps Java APIs point to the wrong location for the API reference

[sgilsonapigee]

For our Google Maps APIs, the Java ref docs are at:

https://github.com/googleapis/google-cloud-java/tree/main/PRODUCT

For example, for the Places API:

https://github.com/googleapis/google-cloud-java/tree/main/java-maps-places

But the template for the README files are pointing to the Cloud Java repo:

https://cloud.google.com/java/docs/reference/PRODUCT

For example:

https://github.com/googleapis/google-cloud-java/blob/main/java-maps-places/README.md

We need to update the template for the READMEs to point to the correct location for all Google Maps APIs.