Update source/content/certification/study-guide-cms/10-custom-upstreams.md

Co-authored-by: Steve Persch <[email protected]>

Author: rachelwhitton

source/content/certification/study-guide-cms/10-custom-upstreams.md

@@ -1,7 +1,7 @@
 ---
 title: WebOps Certification
 subtitle: "Chapter 10: Custom Upstreams"
-description: "Understand the relationship between Pantheon’s Core Upstreams, Custom Upstreams, and Individual Site Repositories."
+description: "Understand the relationship between Pantheon’s Core Upstreams, Custom Upstreams, and individual site repositories."
 certificationpage: true
 type: certificationpage
 layout: certificationpage