[Docs] no-unused-prop-types: Add new example to rule

Fixes #2849

CHANGELOG.md

@@ -22,13 +22,17 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 * [`prop-types`]: default argument does not count as props-types declaration ([#2877][] @golopot)
 * [`jsx-props-no-multi-spaces`]: fix a false positive for beside comments ([#2878][] @golopot)
 
+### Docs
+* [`no-unused-prop-types`]: Add new example to rule ([#2852][] @thehereward)
+
 [#2879]: https://github.com/yannickcr/eslint-plugin-react/issues/2879
 [#2878]: https://github.com/yannickcr/eslint-plugin-react/pull/2878
 [#2877]: https://github.com/yannickcr/eslint-plugin-react/pull/2877
 [#2875]: https://github.com/yannickcr/eslint-plugin-react/issues/2875
 [#2871]: https://github.com/yannickcr/eslint-plugin-react/issues/2871
 [#2870]: https://github.com/yannickcr/eslint-plugin-react/issues/2870
 [#2869]: https://github.com/yannickcr/eslint-plugin-react/issues/2869
+[#2852]: https://github.com/yannickcr/eslint-plugin-react/pull/2852
 [#2851]: https://github.com/yannickcr/eslint-plugin-react/issues/2851
 [#2843]: https://github.com/yannickcr/eslint-plugin-react/pull/2843
 [#2840]: https://github.com/yannickcr/eslint-plugin-react/issues/2840

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

@@ -25,7 +25,7 @@ Hello.propTypes = {
 ```jsx
 type Props = {
   firstname: string,
-  middlename: string, // middlename is never used above
+  middlename: string, // middlename is never used by the Hello component
   lastname: string
 }
 
@@ -36,6 +36,25 @@ class Hello extends React.Component<Props> {
 }
 ```
 
+```jsx
+type Props = {
+  firstname: string;
+  lastname: string;  // lastname isn't used by the Hello component
+};
+
+class Hello extends React.Component<Props> {
+  render() {
+    return <div>Hello {this.props.firstname}</div>;
+  }
+}
+
+class Greetings extends React.Component<Props> {
+  render() {
+    return <div>Greetings  {this.props.firstname} {this.props.lastname}</div>;
+  }
+}
+```
+
 Examples of **correct** code for this rule:
 
 ```jsx