message: remove old, unused docs
diff: @@ -404,17 +404,6 @@ slide.addChart({MULTI_TYPES_AND_DATA}, {OPTIONS_AND_AXES});
  | `valAxisTitleRotate` | integer | degrees | | title rotation degrees | 0-360. Ex: `{ valAxisTitleRotate:45 }` |
  | `valGridLine` | object | | | value grid line style | object with properties `size` (pt), `color` and `style` (`'solid'`, `'dash'` or `'dot'`) or `'none'` to hide |
  -| `secCatAxisVisible` | boolean | | `false` | show secondary category axis | `true` or `false` |
  -| `secCatAxisTitle` | string | | `Axis Title` | show secondary category axis title | a string. Ex: `{ secCatAxisTitle:'Regions' }` |
  -
  -| `secValAxisVisible`| boolean | | `false` | show secondary value-axis title | `true` or `false`. Ex:`{ secValAxisTitleVisible:true }` |
  -| `secValAxisMajorUnit` | number | float | `1.0` | secondary axis tick steps | Float or whole number. Ex: `{ secValAxisMajorUnit:0.2 }` |
  -| `secValAxisMaxVal` | number | | | secondary axis maximum value | 1-N. Ex: `{ secValAxisMaxVal:125 }` |
  -| `secValAxisMinVal` | number | | | secondary axis minimum value | 1-N. Ex: `{ secValAxisMinVal: -10 }` |
  -| `secValAxisOrientation` | string | | `minMax` | secondary axis value orientation | `maxMin` (high->low) or `minMax` (low->high) |
  -| `secValAxisTitle` | string | | `Axis Title` | secondary value-axis title | a string. Ex: `{ secValAxisTitle:'Sales (USD)' }` |
  -
  -
  ### Chart Data Options
  | Option | Type | Unit | Default | Description | Possible Values |
  | :--------------------- | :------ | :------ | :-------- | :------------------------- | :----------------------------------------- |
  