Adds a note about out of memory errors and provides a way to fix that

[onurtore]

🦟 Bug fix

Fixes gz-physics #349

Summary

Adds a note about possible out of memory errors and provides a way to fix that. I changed the documentation in here rather than gz-physics because this error occurs during parallel building of packages.

Checklist

• [+] Signed all commits for DCO
• Added tests
• [+] Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[onurtore]

While I created a PR for this, I am not sure whether adding this would be beneficial for newcomers because related documentation part starts to get crowded.

[chapulina]

I am not sure whether adding this would be beneficial for newcomers because related documentation part starts to get crowded.

That's a good point, I feel like that section should be straight-forward and offer just the commands that the user needs, with a small note pointing to another section below that provides more information for those who need it or want it.

I think this PR is ok as is, because it's not causing the problem, just adding to it. But it would be great to open a new PR after this is merged which organizes things a bit better.