docs: remove trailing whitespace from README

[OmarIthawi]

atlas --help section adds annoying whitespace which makes it annoying to edit the README.rst via code editors.

Without this fix, the developer would need to run make atlas_help_to_readme every time the README.rst is edited manually. Which is pretty annoying.

This pull request fixes it by removing the trailing spaces so there's nothing for code editors to remove on save.

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This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

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[github-actions[bot]]

:tada: This PR is included in version 0.4.2 :tada:

The release is available on:

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• npm package (@latest dist-tag)

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