add contentTypeId to listpicker

Author: russgove

docs/documentation/docs/controls/ListPicker.md

@@ -30,6 +30,7 @@ import { ListPicker } from "@pnp/spfx-controls-react/lib/ListPicker";
             label="Select your list(s)"
             placeHolder="Select your list(s)"
             baseTemplate={100}
+            contentTypeId="0x0101"
             includeHidden={false}
             multiSelect={false}
             onSelectionChanged={this.onListPickerChange} />
@@ -56,14 +57,14 @@ The `ListPicker` control can be configured with the following properties:
 | filter | string | no | Filter list from OData query (takes precendents over Hidden and BaseTemplate Filters). |
 | includeHidden | boolean | no | Whether or not to include hidden lists. Default is `true`. |
 | orderBy | LibsOrderBy | no | How to order the lists retrieved from SharePoint. |
-| selectedList | string OR string[] | no | Keys of the selected item(s). If you provide this, you must maintain selection state by observing onSelectionChanged events and passing a new value in when changed. |
+| selectedList | string OR string[] | no | Keys(list Ids) of the selected item(s). If you provide this, you must maintain selection state by observing onSelectionChanged events and passing a new value in when changed. |
 | multiSelect | boolean | no | Optional mode indicates if multi-choice selections is allowed. Default to `false`. |
 | label | string | no | Label to use for the control. |
 | placeHolder | string | no | Placeholder label to show in the dropdown. **Deprecated. Use `placeholder` instead.** |
 | placeholder | string | no | Placeholder label to show in the dropdown. |
 | onSelectionChanged | (newValue: string OR string[]): void | no | Callback function when the selected option changes. |
 | webAbsoulteUrl | string | no | Absolute Web Url of target site (user requires permissions) |
-
+| contentTypeId | string | no | The Id if a content type which must be present in a list in order for the list to appear in the picker.|
 Enum `LibsOrderBy`
 
 | Value |