fix(rich-text-editor): update placeholder text color (#5212)

* fix(rich-text-editor): update placeholder text color

* doc(rich-text-editor): update release notes

Author: Amarnath510

RELEASENOTES.general.md

@@ -5,6 +5,7 @@
 
 ## Fixed
 - Correction in icons package version.
+- Updated placeholder text color for Rich Text Editor
 
 ## 2.21.2 - June 15, 2023
 

ui/components/rich-text-editor/base/_index.scss

@@ -228,7 +228,7 @@
     user-select: text;
 
     &.ql-blank:before {
-      color: var(--slds-g-color-neutral-base-10, #54698d);
+      color: var(--slds-g-color-neutral-base-50, #54698d);
       content: attr(data-placeholder);
       pointer-events: none;
       position: absolute;