Style span.code as we do for span.command

with a gray border, otherwise the difference is barely noticeable.

wiki/src/local.css

@@ -1101,10 +1101,7 @@ div.icon h2 {
 
 span.application { font-style: italic; }
 span.button { font-weight: bold; }
-span.code {
-  font-family: "Source Code Pro Regular", "Courier", monospace;
-}
-span.command {
+span.code, span.command {
   font-family: "Source Code Pro Regular", "Courier", monospace;
   font-size: 1.071em; /* 14×1.071=15px */
   border: 1px solid #E0E0DF;