formatting on channel page

Why is this change being made?

current page: https://about.gitlab.com/handbook/sales/channel/

after merge: https://patch-19826112020.about.gitlab-review.app/handbook/sales/channel/index.html

• one sentence per line
• removed empty lines at end of file
• removed duplicate text at the beginning of the page
• Added O to OKR

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