Update taxonomy picker docs

Author: joelfmrodrigues

docs/documentation/docs/controls/TaxonomyPicker.md

@@ -169,7 +169,7 @@ The TaxonomyPicker control can be configured with the following properties:
 | label | string | yes | Text displayed above the Taxonomy Picker. |
 | disabled | boolean | no | Specify if the control needs to be disabled. |
 | context | BaseComponentContext | yes | Context of the current web part or extension. |
-| initialValues | IPickerTerms | no | Defines the selected by default term sets. |
+| initialValues | IPickerTerms | no | Defines the terms selected by default. For each term object, an empty string can be provided for properties path and termset. |
 | allowMultipleSelections | boolean | no | Defines if the user can select only one or many term sets. Default value is false. |
 | termsetNameOrID | string | yes | The name or Id of your TermSet that you would like the Taxonomy Picker to chose terms from. |
 | onChange | function | no |  captures the event of when the terms in the picker has changed. |

src/controls/taxonomyPicker/ITaxonomyPicker.ts

@@ -21,7 +21,7 @@ export interface ITaxonomyPickerProps  {
    */
   allowMultipleSelections?: boolean;
   /**
-   * Defines the selected by default term sets.
+   * Defines the terms selected by default. For each term object, an empty string can be provided for properties path and termset.
    */
   initialValues?: IPickerTerms;
   /**
@@ -105,7 +105,7 @@ export interface ITaxonomyPickerProps  {
   onGetErrorMessage?: (value: IPickerTerms) => string | Promise<string>;
 
   /**
-   *  Called when text is in the input field and the enter key is pressed.  
+   *  Called when text is in the input field and the enter key is pressed.
    */
   onNewTerm?: (value: IPickerTerm) => void;