docs: fix wrong link of pouchd config

[zjumoon01]

Signed-off-by: Wangrui baijia.wr@antfin.com

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[CLAassistant]

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[pouchrobot]

We found this is your first time to contribute to Pouch, @zjumoon01
👏 We really appreciate it.
Just remind that you have read the contribution guide: https://github.com/alibaba/pouch/blob/master/CONTRIBUTING.md
If you didn't, you should do that first. If done, welcome again and please enjoy hacking! 🍻

[codecov-io]

Codecov Report

Merging #2107 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2107      +/-   ##
==========================================
- Coverage   65.14%   65.11%   -0.03%     
==========================================
  Files         208      208              
  Lines       16407    16407              
==========================================
- Hits        10688    10684       -4     
- Misses       4388     4393       +5     
+ Partials     1331     1330       -1

Flag	Coverage Δ
#criv1alpha1test	33.14% <ø> (-0.07%)	⬇️
#criv1alpha2test	33.83% <ø> (ø)	⬆️
#integrationtest	39.84% <ø> (-0.04%)	⬇️
#unittest	23.84% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
apis/server/utils.go	61.9% <0%> (-4.77%)	⬇️
daemon/mgr/system.go	77.68% <0%> (-1.66%)	⬇️
ctrd/image.go	76.75% <0%> (-0.44%)	⬇️
cri/v1alpha1/cri.go	63.66% <0%> (-0.18%)	⬇️
daemon/logger/jsonfile/utils.go	73.17% <0%> (+1.62%)	⬆️

[allencloud]

LGTM