docs: fix typos in test circuits chapter text

[magic-peach]

Fixes #521

Updated typo text in docs/chapter7/3testcircuits.md and docs/chapter7/3testcircuits.mdx.

Corrected logical seperation to logical separation, and attch to attach in the MDX page.

How to verify: open both chapter 7 test circuits files and check the corrected words in the test creator section.

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[Nihal4777]

Thanks @magic-peach for the fix. 🙌