Clarify docu regarding .envrc

Version Control Information

Source branch: docs/add-private-config-to-initialization
Target branch: devel

Commits:

* Clarify docu regarding .envrc

In the initialization process described in the docu it was not clear
where to get the template for the user specific envrc from and
what to change.

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docs/_releasenotes/+.docs.envrc-config-init-clarification

+Added clarification in initialization for the different ``.envrc`` used.