doc: Minor fixes to the LTE guide

[divipillai]

Minor fixes to the LTE guide.

[NordicBuilder]

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Build number: 2

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Enabled	Name	Description
	ci-disabled	Disable the ci execution
	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

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• ◻️ Toolchain
• ◻️ Build twister
• ◻️ Integration tests

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[NordicBuilder]

You can find the documentation preview for this PR at this link.

Note: This comment is automatically posted by the Documentation Publish GitHub Action.

[github-actions]

After documentation is built, you will find the preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-20496/nrf/protocols/lte/index.html