[wp-trac] [WordPress Trac] #43104: Add Markdown trailing whitespace rule to `.editorconfig`

[WordPress Trac]

#43104: Add Markdown trailing whitespace rule to `.editorconfig`
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 Reporter:  netweb            |       Owner:
     Type:  enhancement       |      Status:  new
 Priority:  normal            |   Milestone:  5.0
Component:  Build/Test Tools  |     Version:
 Severity:  normal            |  Resolution:
 Keywords:  has-patch commit  |     Focuses:
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Comment (by SergeyBiryukov):

 Added in
 https://github.com/WordPress/gutenberg/commit/906bbab2e157d953bd83abcd640899deffd83ef3.

 Given that WordPress core does not have any `.md` files, not sure how
 necessary this is, though don't see any harm either :)

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Ticket URL: <https://core.trac.wordpress.org/ticket/43104#comment:2>
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