Duplicate PageDown in documentation for completionKeymap

[abelykh0]

Describe the issue

Duplicate PageDown in documentation for completionKeymap
https://codemirror.net/docs/ref/#autocomplete.completionKeymap

PageDown: [moveCompletionSelection](https://codemirror.net/docs/ref/#autocomplete.moveCompletionSelection)(true, "page")
PageDown: [moveCompletionSelection](https://codemirror.net/docs/ref/#autocomplete.moveCompletionSelection)(true, "page")

Browser and platform

No response

Reproduction link

No response

[marijnh]

Looks like I copy-pasted that line to document PageUp, but then failed to actually adjust it. Thanks for spotting that. Attached patch fixes it.