Fix typos in diagnostics

[IS4Code]

Description

Fixes a typo in compiler diagnostics:

• Changed of to or in FS3519.

Checklist

• Test cases added

• Performance benchmarks added in case of performance changes

• Release notes entry updated:

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[github-actions]

❗ Release notes required

@IS4Code,

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Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/10.0.100.md	No release notes found or release notes format is not correct

[T-Gro]

This has been intentional, to align with naming for typars, like

'a , 'b when ..

This came across at #18810 . The thread has a discussion on the topic.

[T-Gro]

The issue shows that this is a source of confusion, so it would definitely benefit from finishing the discussion and changing how the error is rendered.

[IS4Code]

Thank you for the clarification, yeah, that got me confused too. 😅 Though I would probably understand it in the final diagnostics.

If not a typo, maybe it is a bit inconsistent there and should be ''{0}' to align with other places where pieces of syntax are put into apostrophes. In either case, I will remove this from the pull request.