Fix formatting on CLI overview summary

[mdhender]

The sections pull from cobra output and Markdown causes the lines to jumble together. Example:

hugo

hugo hugo builds your site Synopsis hugo is the main command, used to build your Hugo site. Hugo is a Fast and Flexible Static Site Generator built with 

Should look like

hugo

hugo hugo builds your site

Synopsis hugo is the main command, used to build your Hugo site.

Hugo is a Fast and Flexible Static Site Generator built with 

[stale]

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