match code style in table to code style in body (#16516)

Co-authored-by: Chiedo John <2156688+chiedo@users.noreply.github.com>

Author: sarahs

stylesheets/tables.scss

@@ -10,9 +10,10 @@
   table-layout: auto;
 
   code {
-    font-size: 100%;
-    background: none;
-    padding: 0;
+    font-size: 85%;
+    padding: 0.2em 0.4em;
+    background-color: rgba($black, 0.05);
+    border-radius: $border-radius;
   }
 
   thead tr {