message: Update defaultValue and defaultValueExpression descriptions
diff: @@ -1204,8 +1204,13 @@ export class Question extends SurveyElement
  return "";
  }
  /**
  - * Set the default value to the question. It will be assign to the question on loading the survey from JSON or adding a question to the survey or on setting this property of the value is empty.
  - * Please note, this property is hidden for question without input, for example html question.
  + * A default value for the question. Ignored for question types that cannot have a [value](https://surveyjs.io/Documentation/Library?id=Question#value) (for example, HTML).
  + *
  + * The default value is used as a question value in the following cases:
  + *
  + * - While the survey is being loaded from JSON.
  + * - The question is just added to the survey and does not have an answer yet.
  + * - The respondent left the answer empty.
  * @see defaultValueExpression
  */
  public get defaultValue(): any {
  @@ -1220,9 +1225,17 @@ export class Question extends SurveyElement
  this.updateValueWithDefaults();
  }
  /**
  - * Set the default value to the question via expression. This expression will keep change the question value until the value is changed by end-user or via API.
  - * You can use expressions as: "today(2)" it will set the question value to after tomorrow or to today({q1}). If {q1} equals to 1, then the value will be tomorrow. If a user change it to 2 then aftertommrow.
  - * It works in dynamic panel and matrices as well, please use prefix "panel." and "row." to access question value in the same panel or row.
  + * An expression used to calculate the [defaultValue](https://surveyjs.io/Documentation/Library?id=Question#defaultValue).
  + *
  + * This expression applies until the question [value](https://surveyjs.io/Documentation/Library?id=Question#value) is specified by an end user or programmatically.
  + *
  + * An expression can reference other questions as follows:
  + *
  + * - `{other_question_name}`
  + * - `{panel.other_question_name}` (to access questions inside the same dynamic panel)
  + * - `{row.other_question_name}` (to access questions inside the same dynamic matrix or multi-column dropdown)
  + *
  + * An expression can also include built-in and custom functions for advanced calculations. For example, if the `defaultValue` should be today's date, set the `defaultValueExpression` to `"today()"`, and the corresponding built-in function will be executed each time the survey is loaded. Refer to the following help topic for more information: [Use Functions in Expressions](https://surveyjs.io/Documentation/Library#conditions-functions).
  * @see defaultValue
  */
  public get defaultValueExpression(): any {
  