Avoid i++ in array spreads example

This style guide recommends using `i += 1` over `i++`. Even though this
appears in a "bad" example, the example will be clearest if it is "bad"
in fewer ways.

README.md

@@ -350,7 +350,7 @@ Other Style Guides
     const itemsCopy = [];
     let i;
 
-    for (i = 0; i < len; i++) {
+    for (i = 0; i < len; i += 1) {
       itemsCopy[i] = items[i];
     }
 
@@ -565,7 +565,7 @@ Other Style Guides
 
     // good
     const foo = '\'this\' is "quoted"';
-    const foo = `my name is '${name}'`;		
+    const foo = `my name is '${name}'`;
     ```
 
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