Improve atest CLI documentation#574

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doismellburning wants to merge 3 commits intowb2osz:masterfrom

doismellburning:feature/atest-options

Commits on Jun 10, 2025

Add documentation for `atest -e` (set a Bit Error Rate)
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Add documentation for `atest -U` (force upsampling rate for G3RUH)
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Remove duplicate "rather" in atest usage message
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