[Accessibility] Notes should have a lighten gray in the dark mode.

When I was reading the documentation in the dark mode I've noticed that it was hard for my eyes to read the notes or the explanations because of the chosen shade for the grey.

Screenshot

Link

Hello React Navigation

Suggestion

I'd recommend choosing a light gray to make the text of notes more readable for people with low vision like me.

從 issue 中連結的 Hello React Navigation 文件頁面開始，檢查深色模式的樣式，尋找註記或說明。將註記文字與其背景及螢幕截圖進行比較，然後調整相關的灰色，讓低視力人士更容易閱讀文字。完成的標準是：註記在深色模式下具有更好的對比度，同時不影響頁面的外觀。