[UI copy]: Refine copy for bulk-updating prebuilt rules

[nastasha-solomon]

Description

Need to address this feedback on the copy for bulk-updating prebuilt rules.

What release is this request related to?

8.18, 9.0, and Serverless

Point of contact

Main contact: @banderror @maximpn

Stakeholders: @approksiu

[nastasha-solomon]

Hey @banderror @maximpn @approksiu - I put together a new structure for the bulk-update copy here. Feel free to drop comments in the google doc and let me know if I missed anything. Thanks!

@ARWNightingale I gave you access to the doc as well in case you have suggestions from a design or info architecture perspective. Feel free to decline the review request if you don't have the bandwidth.