Add Warning.warn document #2052
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Fix #2050
Warning moduleの説明で「Warning#warnをオーバーライドする」となっていたのを「Warning.warnをオーバーライドする」に修正しました。
これはRDocでもそのようになっており、 #warn の方をオーバーライドするのは誤りです。
https://docs.ruby-lang.org/en/2.6.0/Warning.html#method-i-warn
また、それに合わせて Warning.warn メソッドの説明とサンプルコードを追加しています。
スクショ