docs: Fix Dockerfile path and add ARM-specific instructions

[Shridhar2104]

• Fix incorrect Dockerfile path in development setup documentation
• Add instructions for ARM-based machines (M1/M2 Macs)
• Update documentation to reflect current repository structure

This fixes potential confusion for developers trying to set up the development environment.

What problem does this PR solve?

Issue Number: N/A
Related PR: N/A
Problem Summary: Current documentation points to a non-existent Dockerfile path and lacks instructions for ARM-based machines, causing confusion for developers during setup.

Release note

None

Check List (For Author)

• Test
  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

Manual test steps:

1. Verified the correct path doris/docker/compilation/Dockerfile exists for x86
2. Verified the correct path doris/docker/compilation/arm/Dockerfile exists for ARM
3. Tested the Docker build process with the correct paths on both architectures

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No. (This PR itself is a documentation fix)
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
• Confirm document
• Add branch pick label

[hello-stephen]

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1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
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