docs: update output.mdx

[lio-mengxiang]

I use the output.chunkLoadingGlobal filed in webpack.config.js and want to know how this filed work.

I find the default name is 'webpackChunkdata' string, not 'webpackChunkwebpack' which in this doc.

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[snitin315]

The default seems to be webpackChunkwebpack only in the tests. See here

[lio-mengxiang]

The default seems to be webpackChunkwebpack only in the tests. See here

thanks for answering，i get it and close this issue.