docs: 修正 dispatch 单词

[cumt-robin]

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/dvajs/dva/ISSUE_URL

[codecov-commenter]

Codecov Report

Merging #2480 (749c81f) into master (3eaee30) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2480   +/-   ##
=======================================
  Coverage   85.90%   85.90%           
=======================================
  Files          18       18           
  Lines         518      518           
  Branches      114      114           
=======================================
  Hits          445      445           
  Misses         59       59           
  Partials       14       14           

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[stale[bot]]

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