Update "What is the difference..." table for /handbook/business-ops/

tl;dr - Moving responsibilities owned by Sales/Fields Ops from Marketing Ops to the correct column

Full comment - Moving responsibilities incorrectly categorized under "Marketing Operations" over to "Sales Operations," specifically around Salesforce administration and tech stack tool evaluation and implementation. These functions technically live under Sales Systems, a distinct arm of Field Operations which is separate from Sales Operations. However, for the time being, I recommend we consolidate Systems responsibilities under "Sales Operations" until a time where this table can be overhauled and updated for accuracy.