message: Added more docs for LinearFitVisitor
diff: @@ -669,6 +669,10 @@ table.hovertable td {
  <td title="Calculates kth value">struct <a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/KthValueVisitor.html">KthValueVisitor</a>{ }</td>
  </tr>
  + <tr class="item" onmouseover="this.style.backgroundColor='#ffff66';" onmouseout="this.style.backgroundColor='#d4e3e5';">
  + <td title="Fits linear function through x-y coordinates">struct <a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/PolyFitVisitor.html">LinearFitVisitor</a>{ }</td>
  + </tr>
  +
  <tr class="item" onmouseover="this.style.backgroundColor='#ffff66';" onmouseout="this.style.backgroundColor='#d4e3e5';">
  <td title="Fits y = b0 + b1 * log(x) through x-y coordinates">struct <a href="https://htmlpreview.github.io/?https://github.com/hosseinmoein/DataFrame/blob/master/docs/HTML/PolyFitVisitor.html">LogFitVisitor</a>{ }</td>
  </tr>
  