Remove TODOs from docstrings

[nodeg]

In preparation of the 3.3.0 release, this will remove the TODOs from the property docstrings with actual values.

[codecov]

Codecov Report

Merging #2773 (1bfdf8f) into master (af118f5) will decrease coverage by 0.01%.
The diff coverage is 92.30%.

❗ Current head 1bfdf8f differs from pull request most recent head 0fd777c. Consider uploading reports for the commit 0fd777c to get more accurate results

@@            Coverage Diff             @@
##           master    #2773      +/-   ##
==========================================
- Coverage   43.12%   43.10%   -0.02%     
==========================================
  Files          97       97              
  Lines       14079    14082       +3     
==========================================
- Hits         6071     6070       -1     
- Misses       8008     8012       +4     

Impacted Files	Coverage Δ
cobbler/items/file.py	67.50% <ø> (ø)
cobbler/items/menu.py	65.15% <ø> (ø)
cobbler/items/package.py	89.47% <ø> (ø)
cobbler/items/profile.py	83.78% <ø> (ø)
cobbler/items/repo.py	83.41% <ø> (ø)
cobbler/items/resource.py	89.33% <ø> (ø)
cobbler/items/system.py	76.06% <ø> (ø)
cobbler/items/image.py	77.61% <75.00%> (ø)
cobbler/items/distro.py	87.21% <100.00%> (+0.11%)	⬆️
cobbler/items/item.py	79.44% <100.00%> (+0.05%)	⬆️
... and 3 more

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[SchoolGuy]

So the docs are not perfect yes. But this is a major improvement in my eyes! Let's get this into master. Fixups we can add later.