Update source/handbook/travel/index.html.md

Why is this change being made?

There are duplicate links in the updated travel policy. Removing them to clean it up!

Describe in detail answer to question on why this change is being proposed, in accordance with our value of Transparency

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Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what