Documentation: Update landscape docs for object foundation type

docs/landscape.html

@@ -1852,10 +1852,32 @@
      <li>m2: index into the array of objects, bits 0 to 15 (upper bits in m5)</li>
      <li>m3: random bits</li>
      <li>m5: index into the array of objects, bits 16 to 23 (lower bits in m2)</li>
+     <li style="color: blue">m6 bits 1..0: foundation type:
+      <table style="color: blue">
+       <tr>
+        <td nowrap valign=top><tt>0</tt>&nbsp; </td>
+        <td align=left>none</td>
+       </tr>
+
+       <tr>
+        <td nowrap valign=top><tt>1</tt>&nbsp; </td>
+        <td align=left>flat</td>
+       </tr>
+
+       <tr>
+        <td nowrap valign=top><tt>2</tt>&nbsp; </td>
+        <td align=left>inclined X-axis</td>
+       </tr>
+
+       <tr>
+        <td nowrap valign=top><tt>3</tt>&nbsp; </td>
+        <td align=left>inclined Y-axis</td>
+       </tr>
+      </table>
+     </li>
      <li>m7: animation counter</li>
      <li style="color: blue">m4 bits 7..5: update counter (for objects using land ground sprites), incremented on every periodic processing.<BR>
          For snow and desert, these bits are not used, tile is updated on every periodic processing.</li>
-     <li style="color: blue">m4 bits 4: tile has no effective foundation.</li>
      <li style="color: blue">m4 bits 3..2: ground type (for objects using land ground sprites):
       <table style="color: blue">
        <tr>

docs/landscape_grid.html

@@ -324,9 +324,9 @@ the array so you can quickly see what is used and what is not.
       <td class="bits"><span class="free">O</span><span class="used" title="Water class">XX</span> <span class="used" title="Owner">XXXXX</span></td>
       <td class="bits"><span class="pool" title="Object index on pool (m2 + m5)">XXXX XXXX XXXX XXXX</span></td>
       <td class="bits"><span class="used" title="Random bits">XXXX XXXX</span></td>
-      <td class="bits"><span class="patch" title="Ground update counter">PPP</span> <span class="patch" title="Tile has no effective foundation">P</span> <span class="patch" title="Ground type: grass/bare, snow/desert, shore">PP</span> <span class="patch" title="Ground density">PP</span></td>
+      <td class="bits"><span class="patch" title="Ground update counter">PPP</span><span class="free">O</span> <span class="patch" title="Ground type: grass/bare, snow/desert, shore">PP</span> <span class="patch" title="Ground density">PP</span></td>
       <td class="bits"><span class="pool" title="Object index on pool (m2 + m5)">XXXX XXXX</span></td>
-      <td class="bits"><span class="free">OOOO OOOO</span></td>
+      <td class="bits"><span class="free">OOOO OO</span><span class="patch" title="Foundation type">PP</span> </td>
       <td class="bits"><span class="used" title="Animation counter">XXXX XXXX</span></td>
       <td class="bits" rowspan=1><span class="free">OOOO OOOO OOOO OOOO</span></td>
     </tr>