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 #2195 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2195      +/-   ##
==========================================
+ Coverage   64.98%   64.99%   +0.01%     
==========================================
  Files         208      208              
  Lines       16732    16732              
==========================================
+ Hits        10873    10875       +2     
  Misses       4509     4509              
+ Partials     1350     1348       -2

Flag	Coverage Δ
#criv1alpha1test	32.9% <ø> (+0.17%)	⬆️
#criv1alpha2test	33.63% <ø> (+0.05%)	⬆️
#integrationtest	39.92% <ø> (-0.02%)	⬇️
#unittest	23.95% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
ctrd/watch.go	75.75% <0%> (-4.55%)	⬇️
ctrd/image.go	76.75% <0%> (-0.44%)	⬇️
daemon/mgr/container.go	56.98% <0%> (ø)	⬆️
cri/v1alpha2/cri.go	63.78% <0%> (+0.32%)	⬆️
cri/v1alpha1/cri.go	62.73% <0%> (+0.34%)	⬆️
apis/server/utils.go	66.66% <0%> (+4.76%)	⬆️