## Summary
Added documentation for DOCKER_HOST requirement when using Docker SDKs
with Docker Desktop for Linux.
## Changes
- Added "Using Docker SDKs with Docker Desktop" section to Linux install
docs explaining why SDKs need DOCKER_HOST set and providing
configuration commands
- Added FAQ entry "How do I use Docker SDKs with Docker Desktop for
Linux?" with troubleshooting steps
- Added note in SDK reference docs alerting Docker Desktop for Linux
users to set DOCKER_HOST before using SDKs
Fixes#23308
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