consolidate two marketing specific sections on FP&A page

Why is this change being made?

This change is to consolidate two marketing specific sections on the page that both refer to different aspects of the same BvsA process. Removed repetitive BvsA definitions. cc @cmestel

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