Fix pgindent comment breakage

Author: alvherre

src/backend/access/heap/visibilitymap.c

@@ -476,11 +476,15 @@ visibilitymap_truncate(Relation rel, BlockNumber nheapblocks)
 		/* Clear out the unwanted bytes. */
 		MemSet(&map[truncByte + 1], 0, MAPSIZE - (truncByte + 1));
 
-		/*
+		/*----
 		 * Mask out the unwanted bits of the last remaining byte.
 		 *
-		 * ((1 << 0) - 1) = 00000000 ((1 << 1) - 1) = 00000001 ... ((1 << 6) -
-		 * 1) = 00111111 ((1 << 7) - 1) = 01111111
+		 * ((1 << 0) - 1) = 00000000
+		 * ((1 << 1) - 1) = 00000001
+		 * ...
+		 * ((1 << 6) - 1) = 00111111
+		 * ((1 << 7) - 1) = 01111111
+		 *----
 		 */
 		map[truncByte] &= (1 << truncBit) - 1;