Merge pull request getify#684 from simonebrunozzi/patch-1

Update ch2.md

Author: getify

up & going/ch2.md

@@ -47,7 +47,7 @@ a = { b: "c" };
 typeof a;				// "object"
 ```
 
-The return value from the `typeof` operator is always one of six (seven as of ES6!) string values. That is, `typeof "abc"` returns `"string"`, not `string`.
+The return value from the `typeof` operator is always one of six (seven as of ES6! - the "symbol" type) string values. That is, `typeof "abc"` returns `"string"`, not `string`.
 
 Notice how in this snippet the `a` variable holds every different type of value, and that despite appearances, `typeof a` is not asking for the "type of `a`", but rather for the "type of the value currently in `a`." Only values have types in JavaScript; variables are just simple containers for those values.