added help jsons

resources/function_help/json/array_max

@@ -0,0 +1,8 @@
+{
+  "name": "array_max",
+  "type": "function",
+  "groups": ["Arrays"],
+  "description": "Returns the maximum value of an array.",
+  "arguments": [ {"arg":"array","description":"an array"} ],
+  "examples": [ { "expression":"array_max(array(0,42,4,2))", "returns":"42"}]
+}

resources/function_help/json/array_min

@@ -0,0 +1,8 @@
+{
+  "name": "array_min",
+  "type": "function",
+  "groups": ["Arrays"],
+  "description": "Returns the minimum value of an array.",
+  "arguments": [ {"arg":"array","description":"an array"} ],
+  "examples": [ { "expression":"array_min(array(43,42,54))", "returns":"42"}]
+}