Fix typo in handbook/tools-and-tips/index.html.md
Why is this change being made?
Fix a missing letter in a recently added section of the handbook.
How will this merge request impact page speed?
Does this MR meet the acceptance criteria?
Assign to DRI
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Did you assign this change to the correct DRI of the page or information you are changing?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what