DDC-3974: [GH-1541] Minor docblock correction

[doctrinebot]

Jira issue originally created by user @doctrinebot:

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

Url: #1541

Message:

The documentation for the method ���addJoinedEntityFromClassMetadata��� is a little bit wrong. As we can currently see it says you need to pass an object instead of a string. The $relation variable is passed to ���addJoinedEntityResult��� which is using it as a string.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1541] was assigned:
#1541

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1541] was labeled:
#1541

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1541] was merged:
#1541

[doctrinebot]

Issue was closed with resolution "Fixed"