Fix typo (#1010)

python_packages/jupyter_lsp/jupyter_lsp/virtual_documents_shadow.py

@@ -164,7 +164,7 @@ async def shadow_virtual_documents(scope, message, language_server, manager):
                         "[lsp] initialization of shadow filesystem failed three times"
                         " check if the path set by `LanguageServerManager.virtual_documents_dir`"
                         " or `JP_LSP_VIRTUAL_DIR` is correct; if this is happening with a server"
-                        " for which which you control (or wish to override) jupyter-lsp specification"
+                        " for which you control (or wish to override) jupyter-lsp specification"
                         " you can try switching `requires_documents_on_disk` off. The errors were: %s",
                         failures,
                     )