Update active_support_core_extensions.md

`downcase_first`メソッドの説明文が翻訳されていなかったので修正しました🙇
yasslab · Nov 27, 2024 · 7a1ddcd · 7a1ddcd
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diff --git a/guides/source/ja/active_support_core_extensions.md b/guides/source/ja/active_support_core_extensions.md
@@ -1868,7 +1868,7 @@ NOTE: 定義は`active_support/core_ext/string/inflections.rb`にあります。
 
 #### `downcase_first`
 
-The method [`downcase_first`][String#downcase_first] converts the first letter of the receiver to lowercase:
+[`downcase_first`][String#downcase_first]メソッドはレシーバの冒頭の文字を小文字にします。
 
 ```ruby
 "If I had read Alice in Wonderland".downcase_first # => "if I had read Alice in Wonderland"