add some optional flags in make_polygon expression

(cherry picked from commit 06fab90)

Author: Gustry

resources/function_help/json/make_polygon

@@ -5,9 +5,9 @@
   "variableLenArguments": true,
   "arguments": [
 	{"arg":"outerRing", "description": "closed line geometry for polygon's outer ring"},
-	{"arg":"innerRing1", "syntaxOnly": true},
-	{"arg":"innerRing2", "syntaxOnly": true},	
-	{"arg":"innerRing", "descOnly": true, "description":"optional closed line geometry for inner ring"}],
+	{"arg":"innerRing1", "optional": true, "syntaxOnly": true},
+	{"arg":"innerRing2", "optional": true, "syntaxOnly": true},
+	{"arg":"innerRing", "optional": true, "descOnly": true, "description":"optional closed line geometry for inner ring"}],
   "examples": [ { "expression":"geom_to_wkt(make_polygon(geom_from_wkt('LINESTRING( 0 0, 0 1, 1 1, 1 0, 0 0 )')))", "returns":"'Polygon ((0 0, 0 1, 1 1, 1 0, 0 0))'"},
     { "expression":"geom_to_wkt(make_polygon(geom_from_wkt('LINESTRING( 0 0, 0 1, 1 1, 1 0, 0 0 )'),geom_from_wkt('LINESTRING( 0.1 0.1, 0.1 0.2, 0.2 0.2, 0.2 0.1, 0.1 0.1 )'),geom_from_wkt('LINESTRING( 0.8 0.8, 0.8 0.9, 0.9 0.9, 0.9 0.8, 0.8 0.8 )')))", "returns":"'Polygon ((0 0, 0 1, 1 1, 1 0, 0 0),(0.1 0.1, 0.1 0.2, 0.2 0.2, 0.2 0.1, 0.1 0.1),(0.8 0.8, 0.8 0.9, 0.9 0.9, 0.9 0.8, 0.8 0.8))'"}
     ]