docs(getting_started,fill): add solc instructions for arm64 users with fill issues

[felix314159]

🗒️ Description

When using ARM64 you can't use the solc x86-64 that you end up with when following the old instructions in the docs. Updated the docs with a guide to install solc on ARM and a description of the fill issue that would have resulted if an ARM user would not have followed these instructions.

🔗 Related Issues

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.

[danceratopz]

Thanks a lot for adding this, nice that we have ARM users covered too!

Few suggestions below.

[danceratopz]

Thanks for adding the suggestions, @felix314159.

Following Spencer's offline comment about macOS ARM64, it seems that we need to be a little more precise about the platforms.

@spencer-tb do these make sense to you?

[danceratopz]

Suggested change

	=== "x86-64"
	=== "All x86-64 platforms and ARM64 macOS"

[spencer-tb]

This looks good to me and happy with this as is!

Although maybe its clearer to keep the initial installation commands as they were before, pointing people to troubleshooting directly afterwards. Not that architecture is hard to check, but for the basic new user it might be!