[DOCS] state tutorial pt3 -> use of deprecated argument gid_from_name

[fiala-sns]

Description
Use of "gid_from_name" argument in "user.present" module in version 3006.5 despite beiing deprecated in 3001.1
( https://docs.saltproject.io/en/latest/topics/releases/3001.1.html )

Suggested Fix
Delete line/assign gid by other means

Type of documentation
Salt documentation

Location or format of documentation
https://github.com/saltstack/salt/edit/master/doc/topics/tutorials/states_pt3.rst
line 64

Additional context
I am not sure about proper fix, since I am new to saltstack

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