Stabilize a comment that breaks Ormolu idempotency

Ormolu has [a few problems with idempotency of
comments](https://github.com/tweag/ormolu/issues?q=is%3Aissue+idempotent+comment+is%3Aopen+).
So this converts the one instance that affects us into Haddock that
can’t be moved.

unison-cli/src/Unison/Codebase/Editor/Input.hs

@@ -127,9 +127,10 @@ data Input
   | PullI !PullSourceTarget !PullMode
   | PushRemoteBranchI PushRemoteBranchInput
   | ResetI (BranchId2 {- namespace to reset it to -}) (Maybe UnresolvedProjectBranch {- ProjectBranch to reset -})
-  | -- todo: Q: Does it make sense to publish to not-the-root of a Github repo?
+  | -- | used in Welcome module to give directions to user
+    --
+    -- todo: Q: Does it make sense to publish to not-the-root of a Github repo?
     --          Does it make sense to fork from not-the-root of a Github repo?
-    -- used in Welcome module to give directions to user
     CreateMessage (P.Pretty P.ColorText)
   | -- Change directory.
     SwitchBranchI Path'