NXP backend: Update docs for ET 1.4 release

[roman-janik-nxp]

Summary

Update docs for ET 1.4 release. Revised supported ops, fix broken links, fix missing parameters docs.

Test plan

Docs update.

cc @robert-kalmar @JakeStevens @digantdesai @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/21466

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit 38243ec with merge base c6f166d ():
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[linux-foundation-easycla]

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[robert-kalmar]

@pytorchbot cherry-pick --onto release/1.4 -c {docs}

[pytorch-bot]

❌ 🤖 pytorchbot command failed:

@pytorchbot cherry-pick: error: argument -c/--classification: invalid choice: '{docs}' (choose from 'regression', 'critical', 'fixnewfeature', 'docs', 'release')

usage: @pytorchbot cherry-pick --onto ONTO [--fixes FIXES] -c
                               {regression,critical,fixnewfeature,docs,release}

Try @pytorchbot --help for more info.

[robert-kalmar]

@pytorchbot cherry-pick --onto release/1.4 -c docs

[pytorchbot]

Cherry picking #21466

The cherry pick PR is at #21471 The following tracker issues are updated:

• [v1.4.0] Release Schedule and Tracker #20552 (comment)

Details for Dev Infra team

Raised by workflow job