documentation: Fixes to command descriptions (#506)

Co-authored-by: Duncan Brown <duncan@prometheussoftware.ca>
Co-authored-by: Balloonpopper <balloonpopper@git.com>

addons/escoria-core/ui_library/inventory/esc_inventory_container.gd

@@ -3,7 +3,7 @@ extends Control
 class_name ESCInventoryContainer
 
 
-# Get wether the inventory container currently is empty
+# Get whether the inventory container currently is empty
 # **Returns** Wether the container is empty or not
 func is_empty() -> bool:
 	return get_child_count() > 0