doc: nrf: migration notes: add nrfx 4.0 entry

[masz-nordic]

Provide migration notes for nrfx 4.0 in NCS context.

[Copilot]

Pull request overview

This pull request adds migration notes for nrfx 4.0 in the NCS context, providing developers with guidance on how to update their applications when migrating from nrfx 3.x to 4.0.

Key Changes:

• Added a new "Drivers" section with comprehensive nrfx 4.0 migration guidance
• Documented Kconfig option replacements for various nrfx peripheral drivers
• Added external link to the official nrfx 4.0 migration documentation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
doc/nrf/releases_and_maturity/migration/migration_guide_3.2.rst	Added new "Drivers" section with detailed nrfx 4.0 migration instructions, including Kconfig option replacements for DPPI, I2S, PDM, PPI, PWM, QDEC, SPIM, SPIS, TIMER, TWIM, TWIS, UARTE, WDT, and PPIB peripherals
doc/nrf/links.txt	Added reference link to the official nrfx 3.14.0 to 4.0.0 migration note on GitHub wiki

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[NordicBuilder]

CI Information

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Build number: 5

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	ci-run-zephyr-twister	Force run zephyr twister

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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[github-actions]

You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-25989/nrf/releases_and_maturity/migration/migration_guide_3.2.html

[masz-nordic]

CI is stuck, retriggering.