Administration: Fix color contrast code in .description.

Fix a color contrast failure by changing the color of `code` elements inside form description fields to `#50575e`.

Props sainathpoojary, pmbaldha, sabernhardt, joedolson.
Fixes #63449.

git-svn-id: https://develop.svn.wordpress.org/trunk@60481 602fd350-edb4-49c9-b593-d223f7449a82

Author: joedolson

src/wp-admin/css/edit.css

@@ -1379,6 +1379,11 @@ p.description code {
 	font-style: normal;
 }
 
+p.description code,
+.form-wrap p code {
+	color: #50575e;
+}
+
 .form-wrap .form-field {
 	margin: 1em 0;
 	padding: 0;