chore(docs): improve documentation

Author: nix6839

docs/rules/require-default-props.md

@@ -199,9 +199,7 @@ NotAComponent.propTypes = {
 ...
 "react/require-default-props": [<enabled>, {
   "forbidDefaultForRequired": <boolean>,
-  // For now, this wouldn't support any other choices, and would be optional,
-  // but later could be set to "ignore" as long as `functions` wasn't set to "ignore"
-  "classes": "defaultProps",
+  "classes": "defaultProps | "ignore",
   "functions": "defaultProps" | "defaultArguments" | "ignore"
   // @deprecated Use `functions` option instead.
   "ignoreFunctionalComponents": <boolean>,
@@ -211,8 +209,8 @@ NotAComponent.propTypes = {
 
 - `enabled`: for enabling the rule. 0=off, 1=warn, 2=error. Defaults to 0.
 - `forbidDefaultForRequired`: optional boolean to forbid prop default for a required prop. Defaults to false.
-- `classes`: For now, only works with "defaultProps".
-- `functions`: optional string that this rule determines strategy for the function. "defaultArguments" is recommended. We will change it to deafult later. Defaults to "defaultProps".
+- `classes`: optional string to determine which strategy a class component uses for defaulting props. Defaults to "defaultProps".
+- `functions`: optional string to determine which strategy a functional component uses for defaulting props. "defaultArguments" is recommended. We will change it to deafult later. Defaults to "defaultProps".
 - `ignoreFunctionalComponents`: optional boolean to ignore this rule for functional components. Defaults to false. Deprecated, use `functions` instead.
 
 ### `forbidDefaultForRequired`
@@ -289,15 +287,58 @@ MyStatelessComponent.propTypes = {
 };
 ```
 
+### `classes`
+
+- "defaultProps": Use `.defaultProps`. It's default.
+- "ignore": Ignore this rule for class components.
+
+Examples of **incorrect** code for this rule, when set to `defaultProps`:
+
+```jsx
+class Greeting extends React.Component {
+  render() {
+    return (
+      <h1>Hello, {this.props.foo} {this.props.bar}</h1>
+    );
+  }
+
+  static propTypes = {
+    foo: PropTypes.string,
+    bar: PropTypes.string.isRequired
+  };
+}
+```
+
+Examples of **correct** code for this rule, when set to `defaultProps`:
+
+```jsx
+class Greeting extends React.Component {
+  render() {
+    return (
+      <h1>Hello, {this.props.foo} {this.props.bar}</h1>
+    );
+  }
+
+  static propTypes = {
+    foo: PropTypes.string,
+    bar: PropTypes.string.isRequired
+  };
+
+  static defaultProps = {
+    foo: "foo"
+  };
+}
+```
+
 ### `functions`
 
-- "defaultProps": Use `.defaultProps`.
+- "defaultProps": Use `.defaultProps`. It's default.
 - "defaultArguments": Use object default arguments
 - "ignore": Ignore this rule for functional components.
 
 "defaultArguments" is recommended. We will change it to deafult later.
 
-Examples of **incorrect** code for this rule:
+Examples of **incorrect** code for this rule, when set to `defaultArguments`:
 
 ```jsx
 function Hello({ foo }) {
@@ -335,7 +376,7 @@ Hello.propTypes = {
 };
 ```
 
-Examples of **correct** code for this rule:
+Examples of **correct** code for this rule, when set to `defaultArguments`:
 
 ```jsx
 function Hello({ foo = 'foo' }) {