Fix typos.

Thanks to Janno.

theories/base_logic/lib/sts.v

@@ -45,9 +45,9 @@ Section definitions.
   Proof. solve_proper. Qed.
   Global Instance sts_ctx_persistent `{!invG Σ} N φ : PersistentP (sts_ctx N φ).
   Proof. apply _. Qed.
-  Global Instance sts_own_peristent s : PersistentP (sts_own s ∅).
+  Global Instance sts_own_persistent s : PersistentP (sts_own s ∅).
   Proof. apply _. Qed.
-  Global Instance sts_ownS_peristent S : PersistentP (sts_ownS S ∅).
+  Global Instance sts_ownS_persistent S : PersistentP (sts_ownS S ∅).
   Proof. apply _. Qed.
 End definitions.