[Minor] Increase `code` and `small` font size

interface/css/rspamd.css

@@ -30,6 +30,13 @@ THE SOFTWARE.
 body {
     font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
 }
+code {
+    font-size: 90%;
+}
+small,
+.small {
+    font-size: 85%;
+}
 .text-secondary {
     color: #666 !important;
 }