doc: Updates to AWS IoT lib docs

[divipillai]

NCSDK-28995

• Improve commands on how to install dependencies and usage of the AWS CLI.
• Improve instructions of AWS IoT setup for nRF70 Series

• doc updates pending for the Create a policy section. The policy was not able to be created with the commands provided in steps 2/3 of the "Create a policy" section.

[NordicBuilder]

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Build number: 5

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	ci-force-downstream	Force execution of downstream even if twister fails
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	ci-run-zephyr-twister	Force run zephyr twister

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[NordicBuilder]

You can find the documentation preview for this PR at this link. It will be updated about 10 minutes after the documentation build succeeds.

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[gregersrygg]

Please see my comment regarding folder and $ZEPHYR_BASE/... Otherwise good to go 👍