docs: fix multiple typos

[benja2998]

Changes

I have fixed multiple typos, such as changing A set of instructions can be e re-used in different parts of a script. to A set of instructions that can be re-used in different parts of a script. and changing .**30** to **0.300**.

Checks

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[aetter]

Looks great, thanks a bunch for resubmitting @benja2998!