doc: nrf: releases: Clarify supplicant switch to kernel heap

[krish2718]

We have recieved a few queries about the increase in kernel heap usage when migrated to 2.9.0 from 2.7.0, so, add a couple of notes to clarify the same.

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sdk-nrf: PR head: feb38f4783c747e6cf6b223d1e58c5cf0120343e

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PR head: feb38f4783c747e6cf6b223d1e58c5cf0120343e
merge base: ab1330a0fb2d36f98d3365180df2d339ee503a93
target head (main): ab1330a0fb2d36f98d3365180df2d339ee503a93
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doc
│  ├── nrf
│  │  ├── releases_and_maturity
│  │  │  ├── migration
│  │  │  │  │ migration_guide_2.8.rst

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[krish2718]

@richabp As discussed offline removed release notes changes as we aren't supposed to modify it post-release.