Update

docs_md/components/extended/progress_api.md

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+# Progress Quick API reference
+
+```lua
+progress:empty()
+progress:fill()
+progress:get()
+progress:init(node, key, [init_value])
+progress:on_layout_change()
+progress:on_remove()
+progress:on_style_change(style)
+progress:set_max_size(max_size)
+progress:set_steps(steps, callback)
+progress:set_to(to)
+progress:to(to, [callback])
+progress:update(dt)
+```