Better explain JSON print indent parameter (3.x)

(cherry picked from commit c540a17efc)

doc/classes/JSON.xml

@@ -24,7 +24,7 @@
 			<description>
 				Converts a [Variant] var to JSON text and returns the result. Useful for serializing data to store or send over the network.
 				[b]Note:[/b] The JSON specification does not define integer or float types, but only a [i]number[/i] type. Therefore, converting a Variant to JSON text will convert all numerical values to [float] types.
-				Use [code]indent[/code] parameter to pretty print the output.
+				The [code]indent[/code] parameter controls if and how something is indented, the string used for this parameter will be used where there should be an indent in the output, even spaces like [code]"   "[/code] will work. [code]\t[/code] and [code]\n[/code] can also be used for a tab indent, or to make a newline for each indent respectively.
 				[b]Example output:[/b]
 				[codeblock]
 				## JSON.print(my_dictionary)
@@ -45,6 +45,22 @@
 				        }
 				    ]
 				}
+
+				## JSON.print(my_dictionary, "...")
+				{
+				..."name": "my_dictionary",
+				..."version": "1.0.0",
+				..."entities": [
+				......{
+				........."name": "entity_0",
+				........."value": "value_0"
+				......},
+				......{
+				........."name": "entity_1",
+				........."value": "value_1"
+				......}
+				...]
+				}
 				[/codeblock]
 			</description>
 		</method>