docs: auto generate pouch cli/api docs via code

[pouchrobot]

Signed-off-by: pouchrobot [email protected]

1.Describe what this PR did
This PR is automatically done by AI-based collaborating robot.
Pouchrobot will auto-generate cli/api document via https://github.com/spf13/cobra/tree/master/doc every day.

2.Does this pull request fix one issue?
None

3.Describe how you did it
First, execute command "make client" to build new pouch cli;
Second, execute command "./pouch gen-doc" to generate new cli docs.

For API part, we use a tool swagger2markup to make it.

4.Describe how to verify it
None

5.Special notes for reviews
The cli/api doc must be automatically generated.

[allencloud]

LGTM

[codecov-io]

Codecov Report

Merging #2108 into master will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2108      +/-   ##
==========================================
- Coverage   65.11%   65.03%   -0.09%     
==========================================
  Files         208      208              
  Lines       16409    16409              
==========================================
- Hits        10685    10671      -14     
- Misses       4393     4400       +7     
- Partials     1331     1338       +7

Flag	Coverage Δ
#criv1alpha1test	33.14% <ø> (-0.08%)	⬇️
#criv1alpha2test	33.78% <ø> (-0.11%)	⬇️
#integrationtest	39.83% <ø> (-0.03%)	⬇️
#unittest	23.87% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
apis/server/utils.go	61.9% <0%> (-4.77%)	⬇️
ctrd/watch.go	72.72% <0%> (-3.04%)	⬇️
ctrd/container.go	42.06% <0%> (-1.45%)	⬇️
daemon/mgr/container.go	55.49% <0%> (-0.61%)	⬇️
cri/v1alpha1/cri.go	63.66% <0%> (-0.18%)	⬇️
cri/v1alpha2/cri.go	64.51% <0%> (-0.17%)	⬇️
ctrd/image.go	78.94% <0%> (+1.75%)	⬆️