Fix a comment on a field of the ExprList object.  No changes to code.

FossilOrigin-Name: bb8e264227175fc93f1c86a0083f8ad6c4ce2dc7
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index f2f2cec..9a53d33 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2440,7 +2440,7 @@
 struct ExprList {
   int nExpr;             /* Number of expressions on the list */
   struct ExprList_item { /* For each expression in the list */
-    Expr *pExpr;            /* The list of expressions */
+    Expr *pExpr;            /* The parse tree for this expression */
     char *zName;            /* Token associated with this expression */
     char *zSpan;            /* Original text of the expression */
     u8 sortOrder;           /* 1 for DESC or 0 for ASC */