fix note link

Author: soulomoon

lsp/src/Language/LSP/Server/Core.hs

@@ -856,6 +856,7 @@ The client can still always choose to cancel for another reason.
 -}
 
 {- Note [Shutdown]
+~~~~~~~~~~~~~~~~~~
 The LSP protocol has a two-phase shutdown sequence:
 
 1. `shutdown` request: ask the server to stop doing work and finish