ID 252526 - Add information about matrixAt() not being thread safe to the NDK

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Problem summary
Add information about matrixAt() not being thread safe to the NDK

Reproduced by support

https://www.thefoundry.co.uk/products/nuke/developers/100/ndkdevguide/appendixc/new.html?highlight=matrixat

Expected behaviour
For there to be more information about matrixAt()

Actual behaviour
There isn't

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