add note about not editing JSON crate config

static/js/shop.jsx

@@ -1278,7 +1278,7 @@ class Shop extends React.PureComponent {
     const a = document.createElement('a');
     const num = (new Date()).getTime();
     const subject = `[Order hardware] - Request Quote`;
-    let body = `Hello!\n\nI would like to request a quotation for my below configuration:\n\n${JSON.stringify(crate)}\n\n`;
+    let body = `Hello!\n\nI would like to request a quotation for my below configuration:\n\n${JSON.stringify(crate)}\n\n(Please do not edit the machine-readable representation above)\n\n`;
 
     if (note) {
       body = `${body}\n\nAdditional note:\n\n${note ? note.trim() : ''}`;