show the `border` MFM function in cheatsheet - fixes #533

What does this MR do?

• add an example of border to the cheatsheet
• fix the syntax highlighting example

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Closes #533 (closed)

added bug bugfrontend labels

requested review from @fEmber, @julia, @CenTdemeern1, @Marie, and @tess

added 2 commits

• 49d6fc67 - show the `border` MFM function in cheatsheet - fixes #533 (closed)
• 65c03e3e - actually show off the syntax highlighting

Compare with previous version

changed title from show the border MFM function in cheatsheet - fixes #53 (closed)8 to show the border MFM function in cheatsheet - fixes #53 (closed)3

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approved this merge request

merged

mentioned in commit 9fe0eb5e