docs: add section for command namespaces

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.50000% with 34 lines in your changes missing coverage. Please review.

Project coverage is 55.13%. Comparing base (5bf53e0) to head (5191fb7).
Report is 565 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/account/v3/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/audit_trail/v1alpha1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/billing/v2beta1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/cockpit/v1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/dedibox/v1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/documentdb/v1beta1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/domain/v2beta1/custom.go	0.00%	2 Missing ⚠️
...ternal/namespaces/edge_services/v1alpha1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/interlink/v1beta1/custom.go	0.00%	2 Missing ⚠️
internal/namespaces/ipam/v1/custom.go	0.00%	2 Missing ⚠️
... and 8 more

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (5191fb7). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (5191fb7)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4620       +/-   ##
===========================================
- Coverage   75.45%   55.13%   -20.33%     
===========================================
  Files         202      308      +106     
  Lines       44323    69960    +25637     
===========================================
+ Hits        33444    38572     +5128     
- Misses       9653    29992    +20339     
- Partials     1226     1396      +170     

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