DDC-3995: [GH-1554] Fix a documentation error in the EntityManagerInterface#transactional() return value

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of tai2:

Url: #1554

Message:

This is a fix for #1462

By the documentation

For historical reasons, EntityManager#transactional($func) will return false whenever the return value of $func is loosely false. Some examples of this include array(), "0", "", 0, and null.

No! It's ``true'' !
Returning false whenever a user function returns false is jus a natural behaviour, isn't it?

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1554] was assigned:
#1554

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1554] was merged:
#1554

[doctrinebot]

Issue was closed with resolution "Fixed"