fix sourcemap reference in docs

[tjenkinson]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

Description

It's lowercase in the config.

Usually, a plugin will only omit the sourcemap if it (the plugin, not the bundle) was configured with sourcemap: false

Looks like the commmonjs plugin uses sourceMap 🙈, so not sure if the line about plugins should be left as is, or maybe CommonJS should also accept sourcemap to be more inline with rollup itself?

[codecov]

Codecov Report

Merging #4012 (ee52ddd) into master (170de9a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4012   +/-   ##
=======================================
  Coverage   97.21%   97.21%           
=======================================
  Files         192      192           
  Lines        6762     6762           
  Branches     1973     1973           
=======================================
  Hits         6574     6574           
  Misses        101      101           
  Partials       87       87           

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[lukastaegert]

Thanks!