Fixed some small language errors

[antime10]

Made some small language fixes.

I also wonder if the first sentence of this page "GhostBSD is under constant development and keeps in sync with the latest FreeBSD stable developments source code" could be changed to "GhostBSD is under constant development and keeps in sync with the latest FreeBSD stable development's source code" but I'm not entirely sure about that one.

Summary by Sourcery

Documentation:

• Corrected several typos and grammatical errors in the upgrading guide markdown file, including fixing spelling mistakes like 'opne' to 'open', 'stat' to 'state', and 'perform' to 'performed'

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses several minor grammatical and spelling errors within the upgrading-guide.md file. The changes enhance the document's clarity and readability by correcting typos and improving sentence structure.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Corrected minor grammatical and spelling errors to improve clarity and readability.	Corrected 'opne' to 'open'. Changed 'stat' to 'state'. Changed 'ask' to 'asked'. Changed 'encounter' to 'encountered'. Changed 'use' to 'used'.	user/upgrading-guide.md

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[sourcery-ai]

Hey @o-s-m-o-s - I've reviewed your changes - here's some feedback:

Overall Comments:

• The changes look good, but please address the typo in the commit message ('opne' should be 'open').

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: all looks good

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[Izder456]

shouldn't it be rephrased to "release" rather than "stable" ?

otherwise, this seems fine