update examples for style

add link to no-param-reassign rule documentation

README.md

@@ -637,24 +637,24 @@ Other Style Guides
 
   ```javascript
   // bad
-  function f(a){
+  function f1(a) {
     a = 1;
   }
-  function f(a){
+  function f2(a) {
     if (!a) { a = 1; }
   }
-  function f(obj){
+  function f3(obj) {
     obj.key = 1;
   };
 
   // good
-  function f(a){
-    const b = (a || 1);
+  function f4(a) {
+    const b = a || 1;
   }
-  function f(a = 1){
+  function f5(a = 1) {
   }
-  function f(obj){
-    const key = obj.hasOwnProperty('key') ? obj.key ? 1;
+  function f6(obj) {
+    const key = Object.prototype.hasOwnProperty.call(obj, 'key') ? obj.key : 1;
   };
   ```
 

packages/eslint-config-airbnb/rules/best-practices.js

@@ -75,6 +75,7 @@ module.exports = {
     'no-octal-escape': 2,
     // disallow reassignment of function parameters
     // disallow parameter object manipulation
+    // rule: http://eslint.org/docs/rules/no-param-reassign.html
     'no-param-reassign': [2, { 'props': true }],
     // disallow use of process.env
     'no-process-env': 0,