Add a section showing which editors support multiple LS per file

It looks like Eclipse does: https://github.com/eclipse/che/issues/4609 but it's hard to find additional information on what the stance of other editors is on having multiple LS per file.

And looks like VSCode might based on this issue: https://github.com/microsoft/vscode/issues/48227

Sublime support: https://github.com/sublimelsp/LSP/issues/376