Add soft breaks to guide to improve mobile experience

[lukastaegert]

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

List any relevant issue numbers:

Description

This will add some soft-breaks into long inline code snippets to improve how the docs render on small screens.

[rollup-bot]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#guide-soft-breaks

or load it into the REPL:
https://rollupjs.org/repl/?circleci=14363

[codecov]

Codecov Report

Merging #3976 (6142f3d) into master (a8a56fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3976   +/-   ##
=======================================
  Coverage   97.21%   97.21%           
=======================================
  Files         191      191           
  Lines        6706     6706           
  Branches     1961     1961           
=======================================
  Hits         6519     6519           
  Misses         99       99           
  Partials       88       88           

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