Merge pull request #23639 from 2003Aditya/fix-multi-platform-docs

docs: correct build args in multi-platform guide to include TARGETOS …

Author: dvdksn

content/manuals/build/building/multi-platform.md

@@ -411,9 +411,7 @@ Steps:
    platforms.
 
 3. To add cross-compilation support, update the Dockerfile to use the
-   pre-defined `BUILDPLATFORM` and `TARGETPLATFORM` build arguments. These
-   arguments are automatically available in the Dockerfile when you use the
-   `--platform` flag with `docker build`.
+   pre-defined `BUILDPLATFORM`, `TARGETOS` and `TARGETARCH` build arguments.
 
    - Pin the `golang` image to the platform of the builder using the
      `--platform=$BUILDPLATFORM` option.