In that case you are not really talking about proofreading - which is the final step before publication and is about detecting errors in the text (that is there), or artwork where relevant, or layout issues.
What you're looking for is generally called a Technical Reviewer - one or more experts in the field to review what you've written for correctness and completeness. Much the same problem as with proofreading, the creator will have trouble seeing problems in their own work, so the input from outsiders is invaluable.
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