Fix typo.

Amit Kapila · Amit Kapila · commit 23d0dfa8fa01 · 2020-01-13T14:44:55.000+05:30
Reported-by: Antonin Houska Author: Antonin Houska Backpatch-through: 11, where it was introduced Discussion: https://postgr.es/m/2246.1578900133@antos
diff --git a/src/include/access/session.h b/src/include/access/session.h
@@ -19,7 +19,7 @@ struct SharedRecordTypmodRegistry;
 
 /*
  * A struct encapsulating some elements of a user's session.  For now this
- * manages state that applies to parallel query, but it principle it could
+ * manages state that applies to parallel query, but in principle it could
  * include other things that are currently global variables.
  */
 typedef struct Session
