Add info from #2286, minor fixes to YAML indentation

[microbug]

The information from #2286 doesn't appear to have made it to the docs; it's quite hard to find out how to set the UID and GID to access any volumes with. This can be an issue for users who aren't writing their config files from a user with UID=GID=1000. I added this information to the examples.

Also corrected a minor indentation issue with the YAML examples. Another commit is incoming for a space that I shouldn't have removed...

[codecov-io]

Codecov Report

Merging #3338 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3338      +/-   ##
==========================================
- Coverage   35.69%   35.68%   -0.01%     
==========================================
  Files         281      281              
  Lines       40701    40701              
==========================================
- Hits        14529    14526       -3     
- Misses      24026    24027       +1     
- Partials     2146     2148       +2

Impacted Files	Coverage Δ
modules/process/manager.go	76.81% <0%> (-4.35%)	⬇️
models/repo_indexer.go	48.3% <0%> (ø)	⬆️

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[microbug]

Sounds like the build failure is not related to the changes.

[techknowlogick]

Can you re-push/force-push your commits so CI tries to build your branch again?