DQL "INDEX BY" example looks buggy

[mdhooge]

In dql-doctrine-query-language.rst, when comparing examples from sections 12.2.5. Using INDEX BY and 12.7.2. Pure and Mixed Results, I came to the conclusion that the result of the INDEX BY example (around line #470) is wrong.

Maybe the DQL statement should start by:
SELECT u, u.status, upper(u.name) nameUpper

(with u instead of u.id)