Fixed command line in upgrading-guide.md

[ericbsd]

Summary by Sourcery

Fix the command line instructions in the upgrading guide to ensure the correct use of 'sudo pkg upgrade' for upgrading processes.

Documentation:

• Correct the command line instructions in the upgrading guide to use 'sudo pkg upgrade' instead of 'sudo pkg update'.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request corrects the command line instructions in the upgrading guide documentation. It replaces 'pkg update' with 'pkg upgrade' in two instances to provide the correct command for system upgrades.

File-Level Changes

Change	Details	Files
Corrected the command for system upgrades from 'pkg update' to 'pkg upgrade'	Changed 'sudo pkg update -f' to 'sudo pkg upgrade -f' for kernel mismatch scenarios Changed 'sudo pkg update' to 'sudo pkg upgrade' for non-kernel mismatch scenarios	source/user/upgrading-guide.md
Removed placeholder text for troubleshooting section	Deleted the line '[Content coming soon]' from the troubleshooting section	source/user/upgrading-guide.md

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