Update handbook with EBR process change.

Why is this change being made?

To reflect the change in deactivating auto creation of EBRs. Customers are not all on a quarterly cadence which does not fit the rigid "every quarter" for an EBR.

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