Outdated documentation about $$ around math expression

[gashtaan]

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What article on docs.github.com is affected?

https://github.com/github/docs/blob/main/content/get-started/writing-on-github/working-with-advanced-formatting/writing-mathematical-expressions.md

What part(s) of the article would you like to see updated?

Something has changed recently, $$ symbols around math expression are now ignored and do not force to show the expression as a block. Not sure if it's a feature or a bug, however the documentation doesn't reflect real state anymore, so it either should be fixed or documentation updated.

See paragraph Writing expressions as blocks: On the PNG image the expression is shown as a block centered under the heading, but it doesn't look like it anymore.

Additional information

No response