Typo in Japanese document

[t-hamano]

Checks

• Not a duplicate.
• Not a question, feature request, or anything other than a bug report directly related to Splide. Use Discussions for these topics: https://github.com/Splidejs/splide/discussions

Version

N/A

Description

I couldn't find a place to report a localized documentation fix, so I'm submitting it here.

Document link: https://ja.splidejs.com/guides/options/#fixedheight

• ❌各スライドの幅を固定します。
• ✅ 各スライドの高さを固定します。

Reproduction Link

No response

Steps to Reproduce

N/A

Expected Behaviour

N/A