Initial pgindent and pgperltidy run for v13.

Includes some manual cleanup of places that pgindent messed up,
most of which weren't per project style anyway.

Notably, it seems some people didn't absorb the style rules of
commit c9d297751, because there were a bunch of new occurrences
of function calls with a newline just after the left paren, all
with faulty expectations about how the rest of the call would get
indented.

src/backend/access/nbtree/nbtsearch.c

@@ -156,11 +156,10 @@ _bt_search(Relation rel, BTScanInsert key, Buffer *bufP, int access,
 
 		/*
 		 * We need to save the location of the pivot tuple we chose in the
-		 * parent page on a stack.  If we need to split a page, we'll use
-		 * the stack to work back up to its parent page.  If caller ends up
-		 * splitting a page one level down, it usually ends up inserting a
-		 * new pivot tuple/downlink immediately after the location recorded
-		 * here.
+		 * parent page on a stack.  If we need to split a page, we'll use the
+		 * stack to work back up to its parent page.  If caller ends up
+		 * splitting a page one level down, it usually ends up inserting a new
+		 * pivot tuple/downlink immediately after the location recorded here.
 		 */
 		new_stack = (BTStack) palloc(sizeof(BTStackData));
 		new_stack->bts_blkno = par_blkno;