Docs: fix grammar and spelling on DataDog page
Why is this change being made?
The Datadog page had a spelling error and a grammar issue. Found as part of my work in gitlab-org/technical-writing#94 (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