Update GDScript reference, 'in'-keyword explanation

The explanation for the keyword 'in' states it checks, whether an element is in a list (among others). This is the only occurrence of the word 'list' in this context and I assume it actually means array. To avoid future confusion, it makes sense to replace the word list with array in this explanation.

tutorials/scripting/gdscript/gdscript_basics.rst

@@ -181,7 +181,7 @@ in case you want to take a look under the hood.
 +------------+---------------------------------------------------------------------------------------------------------------------------------------------------+
 | is         | Tests whether a variable extends a given class, or is of a given built-in type.                                                                   |
 +------------+---------------------------------------------------------------------------------------------------------------------------------------------------+
-| in         | Tests whether a value is within a string, list, range, dictionary, or node. When used with ``for``, it iterates through them instead of testing.  |
+| in         | Tests whether a value is within a string, array, range, dictionary, or node. When used with ``for``, it iterates through them instead of testing. |
 +------------+---------------------------------------------------------------------------------------------------------------------------------------------------+
 | as         | Cast the value to a given type if possible.                                                                                                       |
 +------------+---------------------------------------------------------------------------------------------------------------------------------------------------+