Okay here's one of the outputs:
> Before you start, make sure that your AWS credentials are correct. If they are not, S3 rejects the upload with a permission error.
Wouldn't it be better to write:
Before start, ensure AWS credentials are correct. Otherwise, S3 rejects uploads with permission error.
The example is unambiguous. Your modification is ambiguous at best. <failure to ensure aws credentials are correct> != <aws credentials are incorrect>
No, how is that better?
Which one would do better in a college essay? I think the original one, and it has higher word count.
Violates rule 4.2: Do not omit words or use contractions to shorten sentences. Keep articles, keep "that".