docs: improve permissions documentation

[BalduinLandolt]

Pull Request Checklist

Task Description/Number

Adds a tabular overview of all routes of the endpoint. Could serve as a first step towards an improved structure of documentation that eventually should be applied to all documented endpoints.

Basic Requirements

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix: represents bug fixes
• Refactor: represents production code refactoring
• Feature: represents a new feature
• Documentation: documentation changes (no production code change)
• Chore: maintenance tasks (no production code change)
• Style: styles updates (no production code change)
• Test: all about tests: adding, refactoring tests (no production code change)
• Other... Please describe:

Does this PR introduce a breaking change?

• Yes
• No

Does this PR change client-test-data?

• Yes (don't forget to update the JS-LIB team about the change)
• No

[codecov]

Codecov Report

Base: 86.95% // Head: 86.68% // Decreases project coverage by -0.27% ⚠️

Coverage data is based on head (0aa0af0) compared to base (bfe578a).
Patch coverage: 44.19% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2314      +/-   ##
==========================================
- Coverage   86.95%   86.68%   -0.28%     
==========================================
  Files         242      251       +9     
  Lines       28102    28253     +151     
==========================================
+ Hits        24435    24490      +55     
- Misses       3667     3763      +96     

Impacted Files	Coverage Δ
...ain/scala/dsp/project/handler/ProjectHandler.scala	100.00% <ø> (ø)
.../src/main/scala/dsp/role/handler/RoleHandler.scala	88.00% <ø> (ø)
...c/main/scala/dsp/role/repo/impl/RoleRepoLive.scala	100.00% <ø> (ø)
...shared/src/main/scala/dsp/util/UuidGenerator.scala	0.00% <0.00%> (ø)
...erface/src/main/scala/dsp/user/route/GetUser.scala	0.00% <0.00%> (ø)
...ce/src/main/scala/dsp/user/route/MigrateUser.scala	0.00% <0.00%> (ø)
...ace/src/main/scala/dsp/user/route/UserRoutes.scala	0.00% <0.00%> (ø)
...c/main/scala/dsp/user/repo/impl/UserRepoLive.scala	100.00% <ø> (ø)
webapi/src/main/scala/org/knora/webapi/Main.scala	0.00% <0.00%> (ø)
...main/scala/org/knora/webapi/config/AppConfig.scala	81.63% <ø> (ø)
... and 20 more

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[irinaschubert]

LGTM