Clarify store_string vs store_line.
Clarify store_string vs store_line.

While the behavior can be implied from the name, it seems worth stating
it explicitly.

(cherry picked from commit 2762821c08ef011dd44381fd55b6569f99bad41b)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot