Missing INTO clause in SELECT statements of G-8310

The good and bad example in [G-8310](https://trivadis.github.io/plsql-and-sql-coding-guidelines/v4.1/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310/) miss the `into l_record` part.

Furthermore `l_return` should be named `r_return` according the naming conventions. 

The violation of G-5060 is not nice, but can be accepted to simplify the examples.