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]

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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[sourcery-ai]

Hey @ericbsd - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

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[sourcery-ai]

issue (documentation): There's a grammatical error in the unchanged text above this line.

The phrase 'If a similar message than the above one is encounter' should be corrected to 'If a similar message to the above one is encountered'.