Update source/job-families/sales/vp-of-global-channels/index.html.md.erb

Why is this change being made?

To align with https://about.gitlab.com/handbook/hiring/#definitions and remove verbiage like "we are looking for"

Does this MR meet the acceptance criteria?

Conformity

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