Update documentation

Author: Ell Bradshaw

docs/rules/forbid-component-props.md

@@ -45,7 +45,7 @@ Examples of **correct** code for this rule:
 
 An array specifying the names of props that are forbidden. The default value of this option is `['className', 'style']`.
 Each array element can either be a string with the property name or object specifying the property name, an optional
-custom message, and a component allowlist:
+custom message, and either a component allowlist or disallowlist:
 
 ```js
 {
@@ -55,6 +55,16 @@ custom message, and a component allowlist:
 }
 ```
 
+or
+
+```js
+{
+  "propName": "someProp",
+  "disallowedFor": [SomeComponent, AnotherComponent],
+  "message": "Avoid using someProp"
+}
+```
+
 ### Related rules
 
 - [forbid-dom-props](./forbid-dom-props.md)

docs/rules/forbid-dom-props.md

@@ -46,7 +46,17 @@ Examples of **correct** code for this rule:
 
 An array of strings, with the names of props that are forbidden. The default value of this option `[]`.
 Each array element can either be a string with the property name or object specifying the property name, an optional
-custom message, and a DOM nodes disallowed list (e.g. `<div />`):
+custom message, and either a DOM nodes allowed or disallowed list (e.g. `div`):
+
+```js
+{
+  "propName": "someProp",
+  "allowedFor": ["DOMNode", "AnotherDOMNode"],
+  "message": "Avoid using someProp"
+}
+```
+
+or
 
 ```js
 {