Docs: The left_arrow chunk char is missing in chunk mod documentation

[craftopc]

Problem

The documentation files docs/zh_CN/chunk.md and docs/en/chunk.md for the chunk mod do not mention the left_arrow character in the chars configuration table. However, the code and the default configuration in lua/hlchunk/mods/chunk/chunk_conf.lua include left_arrow as a configurable chunk character.

As a result, users who read the documentation may not realize that left_arrow is available as an option, which could cause confusion or missed customization opportunities.

How to reproduce

• Open docs/zh_CN/chunk.md and docs/en/chunk.md.
• Check the configuration examples and descriptions for the chars table. Notice that left_arrow is not listed.
• Compare with the code in chunk_conf.lua where left_arrow is present.

Expected behavior

The documentation should list all available keys for the chars table, including left_arrow, so users know they can customize it.

Suggested solution

Update both docs/zh_CN/chunk.md and docs/en/chunk.md to mention the left_arrow key in the chars table for the chunk mod, both in configuration examples and the descriptive list. Also clarify what the character does in the chunk visual representation.

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Thank you for your awesome work on this plugin!