remove service user doc

[kptkin]

Description

What does the PR do?

This PR removes the user doc for service since it is default now and it also documented in our wandb documentation.

Testing

How was this PR tested?

No need to tests

[codecov]

Codecov Report

Merging #4088 (f940624) into master (47e2ebe) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4088      +/-   ##
==========================================
+ Coverage   82.72%   82.75%   +0.02%     
==========================================
  Files         255      255              
  Lines       32267    32267              
==========================================
+ Hits        26692    26701       +9     
+ Misses       5575     5566       -9     

Flag	Coverage Δ
functest	54.90% <ø> (+0.02%)	⬆️
unittest	73.44% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
wandb/sdk/interface/interface_shared.py	85.17% <0.00%> (-0.32%)	⬇️
wandb/sdk/lib/git.py	79.01% <0.00%> (ø)
wandb/filesync/step_prepare.py	94.93% <0.00%> (+1.26%)	⬆️
wandb/sdk/internal/meta.py	90.79% <0.00%> (+3.06%)	⬆️
wandb/integration/tensorboard/monkeypatch.py	92.59% <0.00%> (+4.93%)	⬆️