Docs: Fix style and typos in Defend direction pages
Why is this change being made?
Several of the Defend direction pages had typos or style issues; this MR corrects them.
Related to gitlab-org/technical-writing#95 (closed)
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
Edited by Marcel Amirault