Equalize the widths of the two columns in the formatting help table

(imported from commit f0a1c7216cfbee777eac4827209ab93c32056515)

templates/zephyr/markdown_help.html

@@ -6,7 +6,7 @@
   </div>
   <div class="modal-body">
     <div id="markdown-instructions">
-      <table class="table table-striped table-condensed table-rounded table-bordered">
+      <table class="table table-striped table-condensed table-rounded table-bordered" id="fmt_help_table">
         <thead><tr>
           <th>You type</th>
           <th>You get</th>

zephyr/static/styles/zephyr.css

@@ -546,3 +546,8 @@ table.floating_recipient {
     background-color: #444;
     color: white;
 }
+
+
+#fmt_help_table {
+    table-layout: fixed;
+}