ajskateboarder
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The scratch-flash codebase makes a reference to help screens with that URL path, so yeah, that's probably one of the Help windows that show up when you right-click some block in 2.0. I don't believe a homepage exists for this, but here's a list of some pages I could find:
https://scratch.mit.edu/help/studio/tips/blocks/answer/
https://scratch.mit.edu/help/studio/tips/blocks/size/
https://scratch.mit.edu/help/studio/tips/blocks/timer/
https://scratch.mit.edu/help/studio/tips/blocks/volume/
https://scratch.mit.edu/help/studio/tips/blocks/tempo/
https://scratch.mit.edu/help/studio/tips/blocks/list/
https://scratch.mit.edu/help/studio/tips/blocks/loudness/
https://scratch.mit.edu/help/studio/tips/blocks/username/
https://scratch.mit.edu/help/studio/tips/blocks/clear/
https://scratch.mit.edu/help/studio/tips/blocks/stamp/
https://scratch.mit.edu/help/studio/tips/blocks/answer/
https://scratch.mit.edu/help/studio/tips/blocks/size/
https://scratch.mit.edu/help/studio/tips/blocks/timer/
https://scratch.mit.edu/help/studio/tips/blocks/volume/
https://scratch.mit.edu/help/studio/tips/blocks/tempo/
https://scratch.mit.edu/help/studio/tips/blocks/list/
https://scratch.mit.edu/help/studio/tips/blocks/loudness/
https://scratch.mit.edu/help/studio/tips/blocks/username/
https://scratch.mit.edu/help/studio/tips/blocks/clear/
https://scratch.mit.edu/help/studio/tips/blocks/stamp/