Merge pull request #8429 from ToasterBiome/patch-2

Clarifies that Lua-style dictionary keys must be string literals in the GD Reference

tutorials/scripting/gdscript/gdscript_basics.rst

@@ -787,7 +787,7 @@ Associative container which contains values referenced by unique keys.
 Lua-style table syntax is also supported. Lua-style uses ``=`` instead of ``:``
 and doesn't use quotes to mark string keys (making for slightly less to write).
 However, keys written in this form can't start with a digit (like any GDScript
-identifier).
+identifier), and must be string literals.
 
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