message: memo: fixed documentation
  The documentation mismatched the actual code.
diff: @@ -254,21 +254,21 @@ The container functions known from STL have been extended to support the differe
  <tr>
  <td rowspan="2">lookup</td>
  <td>`find`</td>
  - <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink (returns `end()`)</td>
  <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink</td>
  <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink (returns `end()`)</td>
  <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink (returns `end()`)</td>
  <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink (returns `end()`)</td>
  <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink (returns `end()`)</td>
  + <td class="ok_green">@link nlohmann::basic_json::find `find` @endlink (returns `end()`)</td>
  </tr>
  <tr>
  <td>`count`</td>
  - <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink (returns `0`)</td>
  <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink</td>
  <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink (returns `0`)</td>
  <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink (returns `0`)</td>
  <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink (returns `0`)</td>
  <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink (returns `0`)</td>
  + <td class="ok_green">@link nlohmann::basic_json::count `count` @endlink (returns `0`)</td>
  </tr>
  </table>
  