ENGCOM-2527: [Forwardport] Fixes Black color coding standard. #17028

 - Merge Pull Request #17028 from chirag-wagento/magento2:2.3-develop-PR-port-17019
 - Merged commits:
   1. 742df86

Author: magento-engcom-team

app/design/adminhtml/Magento/backend/Magento_Backend/web/css/source/_module-old.less

@@ -121,7 +121,7 @@
         }
 
         .mage-suggest-selected > a {
-            color: #000;
+            color: @color-black;
             background: #F1FFEB;
         }
     }

app/design/adminhtml/Magento/backend/web/css/styles-old.less

@@ -487,8 +487,8 @@
     }
 
     .notification-entry-dialog .action-close:hover {
-        color: #000;
-        border-bottom-color: #000;
+        color: @color-black;
+        border-bottom-color: @color-black;
         filter: none;
     }
 
@@ -3798,7 +3798,7 @@
     }
 
     .rule-param .label {
-        color: #000;
+        color: @color-black;
         float: none;
         text-align: left;
         padding: 0;
@@ -5229,7 +5229,7 @@
 @media print {
     * {
         background: transparent !important;
-        color: #000 !important;
+        color: @color-black !important;
         box-shadow: none !important;
         text-shadow: none !important;
         filter: none !important;

lib/web/css/docs/source/_buttons.less

@@ -48,10 +48,10 @@ button {
     &.example-button-3 {
         .lib-button-s();
         border-radius: 0;
-        color: #000;
+        color: @color-black;
         &:hover,
         &.active {
-            color: #000;
+            color: @color-black;
         }
     }
 }

lib/web/css/docs/source/_messages.less

@@ -176,7 +176,7 @@
 //  ```
 //
 
-@message-custom__color: #000;
+@message-custom__color: @color-black;
 @message-custom__background: #fc0;
 @message-custom__border-color: orange;
 
@@ -185,7 +185,7 @@
 @message-custom-link__color-active: darken(@message-custom-link__color, 30%);
 
 @message-custom-icon: @icon-settings;
-@message-custom-icon__color-lateral: #000;
+@message-custom-icon__color-lateral: @color-black;
 @message-custom-icon__background: #green;
 @message-custom-icon__top: 15px;
 @message-custom-icon__right: false;

lib/web/css/docs/source/_tables.less

@@ -1253,7 +1253,7 @@
     .lib-table();
     .lib-table-striped(
         @_stripped-background-color: #ffc,
-        @_stripped-color: #000,
+        @_stripped-color: @color-black,
         @_stripped-direction: horizontal,
         @_stripped-highlight: even
     );

lib/web/css/source/lib/_resets.less

@@ -185,7 +185,7 @@
 
     mark {
         background: #ff0;
-        color: #000;
+        color: @color-black;
     }
 
     small {
@@ -465,13 +465,13 @@
 
     ins {
         background-color: #ff9;
-        color: #000;
+        color: @color-black;
         text-decoration: none;
     }
 
     mark {
         background-color: #ff9;
-        color: #000;
+        color: @color-black;
         font-style: italic;
         font-weight: bold;
     }