fix: remove duplicated Type Extensions

[MangelMaxime]

Fix #941

It seems like they all have the same DeclarationLocation which can make sense if this is just syntax sugar.

[nojaf]

@goswinr could you check if this PR solves your problem?

[MangelMaxime]

To test the change locally, I did something like that:

Adding this code to F# Formatting code, for example at src/FSharp.Formatting.Literate/Literate.fs

module Test =

	type ``[]``<'T>  with //Generic Array
	        member inline xs.First
	            with get () =
					failwith ""
	            and set (v: 'T) =
					failwith ""

and generated the docs locally.

Doing so, I was able at the time to reproduce both the issue and the fix.

[nojaf]

Would like to Goswin (or anyone really) to try this one the actual project.
There were some changes in the compiler with get/set the past years, so would like some confirmation this solves the reported problem.

[goswinr]

@MangelMaxime thank you for fixing this. Your test case looks just like mine. Did you test on net9? @nojaf I am using the latest net9 skd.

[MangelMaxime]

@nojaf In theory, my test was a reproduction but I just tested it locally against @goswinr original project:

Before (online version)

After (local with the fix)

I don't know why the styling is broken in the in the after version, this is perhaps caused by because i run fsbuild in build mode and host a standalone http server, so I don't respect the baseUrl expected (http://192.168.0.197:8080/ VS https://goswinr.github.io/ArrayT). For example, I see some .js file failing to load because of that.

But I didn't touch the CSS in this PR so I didn't spend time trying to fix this "non issue".

[nojaf]

Alright, thank you!