docs: dva disableModelsReExport and lazyLoad

[ycjcl868]

Refs: umijs/plugins#523

Checklist

• npm test passes
• tests are included
• documentation is changed or added
• commit message follows commit guidelines

Description of change

• any feature?
• close https://github.com/umijs/umi/ISSUE_URL

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View rendered docs/plugins/plugin-dva.md
View rendered docs/plugins/plugin-dva.zh-CN.md

[codecov]

Codecov Report

Merging #6401 (77680de) into master (7a52862) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6401   +/-   ##
=======================================
  Coverage   84.73%   84.73%           
=======================================
  Files         157      157           
  Lines        3564     3564           
  Branches      975      975           
=======================================
  Hits         3020     3020           
  Misses        534      534           
  Partials       10       10           

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