bug(progress ring): adjust completed color (#4624)

Author: kflournoy-sf

RELEASENOTES.md

@@ -1,13 +1,17 @@
 <!-- Release notes authoring guidelines: http://keepachangelog.com/ -->
 <!-- !!! THIS FILE IS AUTO-GENERATED !!! DO NOT EDIT THIS FILE MANUALLY !!! -->
 
-## Release 2.15.1 - April 2, 2021
+## Release 2.15.1 - April 7, 2021
 
 ## Components
 ### [Menus](https://www.lightningdesignsystem.com/components/menus)
 #### Added
 - Added `aria-expanded` attribute to menu triggers with value dependent on menu's open state
 
+### [Progress Ring](https://www.lightningdesignsystem.com/components/progress-ring)
+#### Changed
+- Completed progress rings now use `color-background-success-dark` design token.
+
 ## Release 2.15.0 - March 25, 2020
 
 - Removed Salesforce Sans as the default typeface and replaced it with OS-specific defaults.

ui/components/progress-ring/RELEASENOTES.md

@@ -2,6 +2,12 @@
 
 # Progress Ring Release Notes
 
+## 2.15.1
+
+### Changed
+
+- Completed progress rings now use `color-background-success-dark` design token.
+
 ## 2.13.0
 
 ### Changed

ui/components/progress-ring/base/_index.scss

@@ -48,7 +48,7 @@
  * @restrict .slds-progress-ring__progress path, .slds-progress-ring__progress circle
  */
 .slds-progress-ring__path {
-  fill: $color-background-success;
+  fill: $color-background-success-dark;
 }
 
 /**
@@ -129,11 +129,11 @@
   }
 
   .slds-progress-ring__path {
-    fill: $color-background-success;
+    fill: $color-background-success-dark;
   }
 
   .slds-progress-ring__content {
-    background: $color-background-success;
+    background: $color-background-success-dark;
   }
 }