Sunset MultilineBlockBracketsOnSameColumn & ExperimentalStroustrupStyle

[nojaf]

In #2658 we refactoredfsharp_multiline_block_brackets_on_same_column and fsharp_experimental_stroustrup_style into one setting fsharp_multiline_bracket_style.

For v6 we should remove all traces of the old settings and update the documentation.

[josh-degraw]

Can this issue be closed now or are we still waiting on anything else for this? I guess are we still wanting to add a CLI warning if the old settings are used?

[nojaf]

I typically close these issues after the official release, when everything is available on the main branch.

[nojaf]

Available in v6.