[docs] remove outdated docs for no-unused-prop-types

docs/rules/no-unused-prop-types.md

@@ -58,7 +58,6 @@ This rule can take one argument to ignore some specific props during validation.
 ## Known Issues/Limitations
 
 - [False Positives: SFC (helper render methods)](#false-positives-sfc)
-- [False Positives: Intermediate variables](#false-positives-intermediate-variables)
 
 ### False positives SFC
 For components with Stateless Functional Components (often used as helper render methods);
@@ -109,50 +108,3 @@ AComponent.propTypes = {
   bProp: PropTypes.string
 };
 ```
-
-### False positives intermediate variables
-when assigning a part or a whole props object to a variable and using it to access a prop value.
-
-```js
-class AComponent extends React.Component {
-  render() {
-    const { props } = this;
-
-    return <div>{props.aProp}</div>;
-  }
-}
-AComponent.propTypes = {
-  aProp: PropTypes.string // aProp PropType is defined but prop is never used
-};
-```
-
-suggested code structure to avoid the issue:
-
-- accessing prop directly
-```js
-class AComponent extends React.Component {
-  render() {
-    return <div>{this.props.aProp}</div>;
-  }
-}
-AComponent.propTypes = {
-  aProp: PropTypes.string
-};
-```
-
-- or assigning a final prop to a variable.
-
-```js
-class AComponent extends React.Component {
-  const { aProp } = this.props;
-  render() {
-    return <div>{aProp}</div>;
-  }
-}
-AComponent.propTypes = {
-  aProp: PropTypes.string
-};
-```
-
-Using Intermediate variables might be desired and unavoidable for more complex props structure.
-Like for shape prop types. To avoid false positive in this case make sure `skipShapeProps` is set to `true`.