Clarify that RenameOptions is not backwards-compatible
Clarify that RenameOptions is not backwards-compatible

RenameOptions should only used by the server if the client has
`prepareSupport` enabled for textDocument/rename requests.

Signed-off-by: Remy Suen <553f7e7fc51e9ff47ae89d5a0ebd06651241b998@raventelemetry.com>

microsoft/vscode-languageserver-node,microsoft/vscode-languageserver-node,microsoft/vscode-languageserver-node,microsoft/vscode-languageserver-node