docs(file): update file description and add more file examples

[scaleway-bot]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 55.19%. Comparing base (5bf53e0) to head (048c1a4).
Report is 605 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/namespaces/file/v1alpha1/file_cli.go	0.00%	2 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (048c1a4). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (048c1a4)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4697       +/-   ##
===========================================
- Coverage   75.45%   55.19%   -20.27%     
===========================================
  Files         202      311      +109     
  Lines       44323    79134    +34811     
===========================================
+ Hits        33444    43678    +10234     
- Misses       9653    34053    +24400     
- Partials     1226     1403      +177     

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