Fix documentation for client-thrift and client-retry

[pppurple]

Motivation:

I found an incorrect class name and the use of deprecated functions in the document.
Therefore I fixed it to use the recommended function instead.

Modifications:

• Change ThriftClient to ThriftClients
• Use RetryConfig instead of deprecated functions.

Result:

• The corrected document will be displayed.

[CLAassistant]

All committers have signed the CLA.

[pppurple]

The deprecated spec is as follows.
https://javadoc.io/static/com.linecorp.armeria/armeria-javadoc/1.32.3/com/linecorp/armeria/client/retry/RetryingClient.html#newDecorator(com.linecorp.armeria.client.retry.RetryRule,int)

[pppurple]

The deprecated spec is as follows.
https://javadoc.io/static/com.linecorp.armeria/armeria-javadoc/1.32.3/com/linecorp/armeria/client/retry/RetryingClient.html#newDecorator(com.linecorp.armeria.client.retry.RetryRule,int,long)

[github-actions]

🔍 Build Scan® (commit: 866d479)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/cmfpfful4gyki
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/ahhsampsltkrk
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/uuqkyqewgbi64
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/eph5juxw7bxgc
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/2j7apj2bpkz46
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/b6yf5eckxuvhs
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/xov2or5h3wjbw

[ikhoon]

Thanks, @pppurple!

[trustin]

Thanks a lot for the fixes, @pppurple! 🙏

[minwoox]

Thanks!