Docs: fix wrong config in max-len example. (#9309)

* Docs: fix wrong config in max-len example.

* Update max-len.md

Author: aladdin-add

docs/rules/max-len.md

@@ -144,10 +144,10 @@ var longRegExpLiteral = /this is a really really really really really long regul
 
 ### ignorePattern
 
-Examples of **correct** code for this rule with the `{ "ignorePattern": true }` option:
+Examples of **correct** code for this rule with the `ignorePattern` option:
 
 ```js
-/*eslint max-len: ["error", { "ignorePattern": "^\\s*var\\s.+=\\s*require\\s*\\(/" }]*/
+/*eslint max-len: ["error", { "ignorePattern": "^\\s*var\\s.+=\\s*require\\s*\(" }]*/
 
 var dep = require('really/really/really/really/really/really/really/really/long/module');
 ```