docs: clarify executables on download page

DOWNLOAD.md

@@ -31,7 +31,8 @@ href="../MANUAL.html#installing">installation docs</a>.
     <th width="33%"><a href="download/hledger-0.14-win-i386.gz"><img src="../windows.png" border=0 /></a><br />Windows</th>
   </tr>
   <tr style="text-align:center; white-space:nowrap;"><td width="25%">**32-bit**</td><td width="25%">**64-bit**</td><td width="25%"></td><td width="25%"></td></tr>
-  <tr class="heading"><td colspan=4>command-line interface:</td></tr>
+
+  <tr class="heading"><td colspan=4>**hledger** (command-line interface):</td></tr>
   <tr align="center">
     <td>
       [hledger-0.14-linux-i686.gz](download/hledger-0.14-linux-i686.gz)<br><br>
@@ -46,8 +47,9 @@ href="../MANUAL.html#installing">installation docs</a>.
       [hledger-0.14-windows-i386.exe.zip](download/hledger-0.14-windows-i386.exe.zip)
     </td>
   </tr>
+
   <!-- <tr><td colspan=4>optional add-ons:</td></tr> -->
-  <tr class="heading"><td colspan=4>web interface:</td></tr>
+  <tr class="heading"><td colspan=4>**hledger-web** (web interface):</td></tr>
   <tr align="center">
     <td>
       [hledger-web-0.14-linux-i686.gz](download/hledger-web-0.14-linux-i686.gz)<br><br>
@@ -62,7 +64,8 @@ href="../MANUAL.html#installing">installation docs</a>.
       -
     </td>
   </tr>
-  <tr class="heading"><td colspan=4>text interface:</td></tr>
+
+  <tr class="heading"><td colspan=4>**hledger-vty** (curses interface):</td></tr>
   <tr align="center">
     <td>
       [hledger-vty-0.14-linux-i686.gz](download/hledger-vty-0.14-linux-i686.gz)<br><br>
@@ -77,7 +80,7 @@ href="../MANUAL.html#installing">installation docs</a>.
       -
     </td>
   </tr>
-  <tr class="heading"><td colspan=4>pie chart generator:</td></tr>
+  <tr class="heading"><td colspan=4>**hledger-chart** (pie chart generator):</td></tr>
   <tr align="center">
     <td>
       -