Update build from source documentation

[deka014]

Fixes #3013

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• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the develop branch of the repository
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• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[dmos62]

I'll review it, since the relevant issue is part of my backend fixes project.

[dmos62]

Thanks for the PR! I'll merge in a moment after I commit a slight change to wording.

[dmos62]

On second thought, @silentninja would you mind giving this a second look?

[silentninja]

Thanks for the PR @deka014! It looks good to me

Fixed by @dmos62 commits