Particle update func pgs from doc broken

Questions
1

From the docs: Babylon.js docs
Broken pgs: https://playground.babylonjs.com/#MRRGXL#950, https://playground.babylonjs.com/#WJBZQH#104

Console is complaining about _scaledDirection being undefined or some such. I think this is from some recent work as my local v8.49.6 is still working fine.

2

Thanks for reporting, this PR will fix the PGs:

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