Reformat some node comments

Reformat some comments in node field definitions to avoid long lines.

This makes room for per-field annotations in a future patch to
generate node support functions automatically.

Discussion: https://www.postgresql.org/message-id/c5906b07-220a-a3d4-8ff3-8ee593009424@enterprisedb.com

Author: petere

src/include/nodes/parsenodes.h

@@ -123,7 +123,8 @@ typedef struct Query
 
 	QuerySource querySource;	/* where did I come from? */
 
-	uint64		queryId;		/* query identifier (can be set by plugins) */
+	/* query identifier (can be set by plugins) */
+	uint64		queryId;
 
 	bool		canSetTag;		/* do I set the command result tag? */