Fix typo in comment.

theories/proofmode/ltac_tactics.v

@@ -766,7 +766,7 @@ Tactic Notation "iIntoEmpValid" open_constr(t) :=
 [lazy_tc] denotes whether type class inference on the premises of [lem] should
 be performed before (if false) or after (if true) [tac H] is called.
 
-The tactic [iApply] uses laxy type class inference, so that evars can first be
+The tactic [iApply] uses lazy type class inference, so that evars can first be
 instantiated by matching with the goal, whereas [iDestruct] does not, because
 eliminations may not be performed when type classes have not been resolved.
 *)