doc: fix the repository URL

[Letty5411]

Signed-off-by: letty [email protected]

Ⅰ. Describe what this PR did

mirrors.cloud.aliyuncs.com is an address used for aliyun vpc and inner network. Although we have test pouch installation in alibaba and alibaba ecs, but we still do not trigger the bug that outer internet address can not access this address.

So this PR changed this address to mirrors.aliyun.com.

Ⅱ. Does this pull request fix one issue?

none

Ⅲ. Describe how you did it

change valid internet accessible address.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

none

[allencloud]

LGTM

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@9e3e901). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #913   +/-   ##
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  Coverage          ?   13.7%           
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  Files             ?     121           
  Lines             ?    7648           
  Branches          ?       0           
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  Hits              ?    1048           
  Misses            ?    6510           
  Partials          ?      90

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