Revise ./integration/jenkins.md for Ecosystem

As part of the ongoing cleanup for this stage and group described in #323644 (comment 530869621), the technical writer for this group will review and revise this page to:

• Meet current style guidelines.
• Correct any obvious deficiencies or outdated items.
• Implement CTRT for the page, including renaming or restructuring sections.

Note: this work is lower in priority than feature work. The goal is to set smaller, achievable goals per milestone to ensure this work does not slip.

Page to revise

./integration/jenkins.md

Related issues

Related to #323644 (closed)