Fix function prop rendering as `noRefCheck` in storybook docs

[thisisanto]

Related to #17701, not quite the same i think.

What I did

According to react-element-to-jsx-string, function props are rendered as

function noRefCheck() {}

However, I found that for me, they're rendered without the space between the brackets.

-function noRefCheck() {}
+function noRefCheck(){}

As such, I updated the replacement regex to account for both cases, which fixes my problem.

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