docs: replace placeholder TODO with full Random module docs and rename parameters from min/max to start/end

doc/site/modules/io/index.markdown

@@ -1,4 +1,4 @@
-^title IO Module
+^title Module "io"
 
 **TODO**
 

doc/site/modules/io/template.html

@@ -22,7 +22,7 @@
   <nav class="big">
     <ul>
       <li><a href="../">Modules</a></li>
-      <li><a href="./">IO</a></li>
+      <li><a href="./">io</a></li>
     </ul>
     <section>
       <h2>io classes</h2>
@@ -36,7 +36,7 @@
     <table>
       <tr>
         <td><a href="../">Modules</a></td>
-        <td><a href="./">IO</a></td>
+        <td><a href="./">io</a></td>
       </tr>
       <tr>
         <td colspan="2"><h2>io classes</h2></td>