docs: Add scroll behaviour smooth (#16056)

* docs: Add scroll behaviour smooth

* docs: remove body tag

Author: amareshsm

docs/src/assets/scss/docs.scss

@@ -1,5 +1,9 @@
 /* docs layout styles */
 
+html {
+    scroll-behavior: smooth;
+}
+
 .docs {
     max-width: 1700px;
     margin: 0 auto;