[DOCS] minor classref updates

doc/classes/Dictionary.xml

@@ -6,8 +6,18 @@
 	<description>
 		Dictionary type. Associative container which contains values referenced by unique keys. Dictionaries are always passed by reference.
 		Erasing elements while iterating over them [b]is not supported[/b].
+		Creating a dictionary:
+		[codeblock]
+		var d = {4: 5, "A key": "A value", 28: [1, 2, 3]}
+		[/codeblock]
+		To add a key to an existing dictionary, access it like an existing key and assign to it:
+		[codeblock]
+		d[4] = "hello"  # Add integer 4 as a key and assign the String "hello" as its value.
+		d["Godot"] = 3.01  # Add String "Godot" as a key and assign the value 3.01 to it.
+		[/codeblock]
 	</description>
 	<tutorials>
+		<link>https://docs.godotengine.org/en/latest/getting_started/scripting/gdscript/gdscript_basics.html#dictionary</link>
 	</tutorials>
 	<demos>
 	</demos>