General proofreading (#1262)

* General proofreading for grammar and spelling
* General formatting
* Addition of appropriate literals where appropriate, i.e. `&"foo"` for `StringName` cases and `^"foo/bar"` for `NodePath` cases

plugins/addons/material_creator/material_resource.gd

@@ -9,7 +9,7 @@ class_name SillyMaterialResource
 
 
 # Create a StandardMaterial3D from the resource's properties.
-# Convert our data into an dictionary so we can convert it
+# Convert our data into a dictionary so we can convert it
 # into the JSON format.
 func make_json() -> String:
 	var json_dict := {}