Delete spawning.md

Fixes #226

docs/en/manuals/spawning.md

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-title: Dynamic spawning in Defold
-brief: This manual describes how to dynamically spawn game objects.
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-# Resources and spawning
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-This manual explains Defold's dynamic spawning features and how to use them.
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-Defold has two components that are used to dynamically spawn game objects into a running game. They allow you to create things like bullets that appear when the player fires a weapon, effects that spawn at certain triggers or, perhaps, pickups that are dropped when an enemy is defeated.
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