[QNN] [FOR TESTING PURPOSE] Qualcomm backend documentation minor typos.

[winskuo-quic]

🐛 Describe the bug

PLEASE IGNORE THIS ISSUE. This is just for some internal testing purpose.

https://github.com/pytorch/executorch/blob/main/backends/qualcomm/_passes/i64_to_i32.py seems to have some grammar mistakes and typos.

Versions

NA

cc @cccclai @shewu-quic @haowhsu-quic @DannyYuyang-quic @cbilgin @abhinaykukkadapu