Fix 10-31_E1 download link; tweak header label

Author: ctrueden

images/index.html

@@ -55,7 +55,7 @@
 
       <table class="table">
         <tr>
-          <th>Thumb</th>
+          <th>Thumbnail</th>
           <th>Download</th>
           <th>File format</th>
           <th>File size</th>
@@ -122,7 +122,7 @@
 
         <tr>
           <td><img src="10-31_E1.jpg" width="100"></td>
-          <td><a href="https://samples.scif.io/10-31%20E1.zip">10-31 E1.zip</a></td>
+          <td><a href="https://samples.scif.io/10-31_E1.zip">10-31_E1.zip</a></td>
           <td>Olympus Fluoview TIFF</td>
           <td>50,556,723 bytes</td>
           <td>uint16</td>