[bug fix] 修复在windows上构建docs-entry.js错误的问题

[XiaoGaoYang]

Fixes #2228

Changes you made in this pull request:

• build/build-entry.js中的 buildDocsEntry 函数中使用 replace 将 windows 系统中的 \ 替换为 /

[codecov-io]

Codecov Report

Merging #2229 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2229   +/-   ##
=======================================
  Coverage   87.18%   87.18%           
=======================================
  Files         100      100           
  Lines        1772     1772           
  Branches      361      361           
=======================================
  Hits         1545     1545           
  Misses        177      177           
  Partials       50       50

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[chenjiahan]

👍