Update link.rst: :doc:
ディレクティブのサンプルコードを修正
#122
Merged
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:doc:
ディレクティブのパスに拡張子を付けると、ビルド時に"unknown document"というメッセージが表示され、リンクは生成されません。 このサンプルコードではリンクは生成されなかっため、正しいパスに変更しました。