(Documentation issue) Client Retry link is 404 in multiple files

[renamoo]

Some of Java doc includes a link to https://github.com/googleapis/google-cloud-java/blob/main/docs/client_retries.md which is 404. It appears as a link on API document.

Probably the right place is https://docs.cloud.google.com/java/docs/client-retries now.

[zhumin8]

Thanks for reporting this issue.
This was recently fixed in #4029, and should propagated to google-cloud-java repo at this recent release: https://github.com/googleapis/google-cloud-java/releases/tag/v1.76.0