Style: Misc docs and comment style and language fixes

- Removed empty paragraphs in XML.
- Consistently use bold style for "Example:", on a new line.
- Fix usage of `[code]` when hyperlinks could be used (`[member]`, `[constant]`).
- Fix invalid usage of backticks for inline code in BBCode.
- Fix some American/British English spelling inconsistencies.
- Other minor fixes spotted along the way, including typo fixes with codespell.
- Don't specify `@GlobalScope` for `enum` and `constant`.

editor/editor_properties_array_dict.cpp

@@ -466,7 +466,7 @@ void EditorPropertyArray::drop_data_fw(const Point2 &p_point, const Variant &p_d
 
 		Variant array = object->get_array();
 
-		// Handle the case where array is not initialised yet.
+		// Handle the case where array is not initialized yet.
 		if (!array.is_array()) {
 			Callable::CallError ce;
 			Variant::construct(array_type, array, nullptr, 0, ce);