Fixed wordings in access-control doc for F#.

[shethaadit]

Summary

Fixed wordings in access-control doc for F#.

Fixes #41852

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docs/fsharp/language-reference/access-control.md	Access Control

[psfinaki]

Nice, thank you! :)

[T-Gro]

From the same docs, this is where access specifiers make sense:
public, internal, and private can be applied to modules, types, methods, value definitions, functions, properties, and explicit fields.

Access control e.g. for a let x = 5 inside a function does not apply, since it will become a stack variable.

What is the real intention please?
Is it to cover functions inside other functions?

[BillWagner]

Hi @shethaadit @T-Gro

Can you work on the resolution to the comment above? Do we need more work here?

[shethaadit]

Hi @BillWagner, thank you for your comment.

@T-Gro, since @psfinaki has already approved the PR, not sure what should we change.

@T-Gro, could you provide your inputs?

[T-Gro]

Let bindings inside a function will often become just stack values, which do not have any access modifier.
I would rather keep the original phrasing as it was.

If you want to expand on "functions declared within other functions", it should be its own sentence.

[shethaadit]

Hi @psfinaki, could you please provide your inputs so we can close this?

[psfinaki]

@shethaadit I agree with the above. I approved the PR because it makes the docs better anyway but the @T-Gro's inputs are valid so if it's not much effort for you, I would also appreciate if you address those.

Sorry for this taking long, Xmas came in sight, hope we'll progress with this quickly now.

Thanks for your continuous efforts around F# docs!