#11565: Fix several typos. Patch by Piotr Kasprzyk.
diff --git a/Include/abstract.h b/Include/abstract.h
index e4ce5ad..a377423 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -509,7 +509,7 @@
       arbitrary data.
 
       0 is returned on success.  buffer and buffer_len are only
-      set in case no error occurrs.  Otherwise, -1 is returned and
+      set in case no error occurs.  Otherwise, -1 is returned and
       an exception set.
 
        */
@@ -524,7 +524,7 @@
       writeable memory location in buffer of size buffer_len.
 
       0 is returned on success.  buffer and buffer_len are only
-      set in case no error occurrs. Otherwise, -1 is returned and
+      set in case no error occurs. Otherwise, -1 is returned and
       an exception set.
 
        */