suggeste to improve the math rigorousness for "Flow Matching Guide and Code"

[wangmiaowei]

Thanks for your contribution in this tutorial(https://arxiv.org/pdf/2412.06264), but I noticed several math errors when reading the first several parts:

1. please use the partial derivative not total derivative for the conservation.

2. Error in this equation, should not include tri in Expectation.

.... I will keep on reviewing this book.

[wangmiaowei]

update: error:

.

really suggest to remodify this guidance.

[kashif]

2nd typo already flagged in #26

[wangmiaowei]

why a superscript for x? in fact, symbols in a messy (for example, q(y) not q(x) during forward Euler.), not good for beginner

[wangmiaowei]

confusion about "near noise"... to me the singularity is caused by the sigma... so i think should be 'near data'