Hello world example: Inform deprecation before user encounters it

[acastellane]

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URL to the relevant documentation

https://docs.quantum.ibm.com/guides/hello-world

Select all that apply

• [ ] typo
• [ ] code bug
• [ ] out-of-date content
• [ ] broken link
• [x] other

Describe the fix.

Note: This video uses the QiskitRuntimeService.get_backend method, which has since been deprecated. Use QiskitRuntimeService.backend instead.

Suggestion to move this note before the video, so that user is informed before using a deprecated command.

[javabster]

Thanks for opening this issue and giving your feedback, this is a good suggestion and we will implement it when we can. You are also welcome to open a PR with this fix too if you like