Merge branch 'update-sus-name' into 'master'

Add full name of SUS

See merge request !27917

data/performance_indicators.yml

@@ -783,7 +783,7 @@
     - Note that this is a newly proposed KPI, and is not ready for the 5/21/2019 meeting, but we will plan to show metrics around response times for the next metrics/KPIs meeting.
 
 - name: Perception of System Usability
-  description: Industry-standard survey that measures overall system usability based on 10 questions. While it’s on a 100-point scale, the rating is not equivalent to report-card-style grading—in an analysis of ~1000 SUS scores, the top score received was 93.9. Moving a SUS score upward even a couple of points on a large system is a significant change. Understand how usability of the GitLab product rates against industry standards, and track trends over time.
+  description: The System Usability Scale (SUS) is an industry-standard survey that measures overall system usability based on 10 questions. While it’s on a 100-point scale, the rating is not equivalent to report-card-style grading—in an analysis of ~1000 SUS scores, the top score received was 93.9. Moving a SUS score upward even a couple of points on a large system is a significant change. Understand how usability of the GitLab product rates against industry standards, and track trends over time.
   orgs:
     - UX Department
   is_key: true