Missing stuff in Proofmode.md.

Thanks to Janno for spotting this!

ProofMode.md

@@ -123,10 +123,10 @@ The later modality
   hypotheses. If the argument `n` is not given, it strips one later if the
   leftmost conjuct is of the shape `▷ P`, or `n` laters if the leftmost conjuct
   is of the shape `▷^n P`.
-- `iLöb as "IH" forall (x1 ... xn)` : perform Löb induction by generating a
-  hypothesis `IH : ▷ goal`. The tactic generalizes over the Coq level variables
-  `x1 ... xn`, the hypotheses given by the selection pattern `selpat`, and the
-  spatial context.
+- `iLöb as "IH" forall (x1 ... xn) "selpat"` : perform Löb induction by
+  generating a hypothesis `IH : ▷ goal`. The tactic generalizes over the Coq
+  level variables `x1 ... xn`, the hypotheses given by the selection pattern
+  `selpat`, and the spatial context.
 
 Induction
 ---------