Correct FLEXSPI_TransferNonBlocking doxygen reference

[DennisSHCheung]

Prerequisites

• I have checked latest main branch and the issue still exists.
• I did not see it is stated as known-issue in release notes.
• No similar GitHub issue is related to this change.
• My code follows the commit guidelines of this project.
• I have performed a self-review of my own code.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.

Describe the pull request

This PR aims to correct the doxygen reference of FLEXSPI_TransferGetCount in FLEXSPI_TransferNonBlocking and is a non-functional change.

Type of change

• This change requires a documentation update

Tests

No tests were executed as it's a doxygen reference update.

[Albort12138]

Hi @DennisSHCheung, thank you for your contribution. We apologize for the inconvenience. We have stopped updating the mcux-sdk project, and this repository will be archived in six months. Therefore, this PR will not be accepted here.

If you would like to continue contributing, please move to our new SDK project: mcuxsdk.