Fix trailing space showing up in example
The current text is rendered as: U+005B ..= U+0060 ``[ \ ] ^ _ ` ``, or (**note the final space!**)
This patch changes that to render as: U+005B ..= U+0060 `` [ \ ] ^ _ ` ``, or (**note no final space!**)
The reason for that, is that CommonMark has a solution for starting or ending inline code with a backtick/grave accent: padding both sides with a space, makes that padding disappear.
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