DEV: add TCEs to MGET command page

[dwdougherty]

The next round of code examples, this time for MGET.

---

Note

Low Risk
Low risk documentation-only change; main risk is example snippets failing to compile/run in the docs test harness due to new language fixtures and cleanup/assert logic.

Overview
Adds a clients-example block to the MGET command page showing expected Redis CLI input/output and wiring it to the shared cmds_string example set.

Introduces new cmds_string client examples for MGET across multiple languages/libraries (Go, C/hiredis, Node redis + ioredis, Python, PHP/Predis, Java/Jedis + Lettuce async/reactive, C#/StackExchange.Redis), including basic setup/cleanup and assertions where applicable.

^{Written by Cursor Bugbot for commit 821086b. This will update automatically on new commits. Configure here.}

[github-actions]

DOC-5637

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-5637/commands/mget/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

---

^{Security scan by Jit}

[andy-stark-redis]

All of them look OK (including Rust) and they all seem to have the correct command API mapping, so LGTM. Well done (still amazed that we've even got C examples)!

[dwdougherty]

Thank you, @andy-stark-redis! Now off to wrangle with the buggerer.

[andy-stark-redis]

Thank you, @andy-stark-redis! Now off to wrangle with the buggerer.

Yes, back to buggery with you! :-)

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}