docs(loadable-components): fix misleading plugin config in .swcrc

[jpoissonnet]

Why?

The README.md gives us a line that doesn't work in the .swcrc.
This is just a little PR to avoid people wasting time reading this config

[changeset-bot]

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Latest commit: 297dfd9

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[CLAassistant]

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[kdy1]

Please patch https://github.com/jpoissonnet/plugins/blob/35e8037622d651ea4b071db0d308c6e5e3469fa1/packages/loadable-components/README.md.tmpl instead