[G11n] 请评审Avocado VT，Community，digest-list-tools的readme优化文件

Attachments:

• attachment.htm (text/html — 459 bytes)
• AvocadoVT-ch.md (application/octet-stream — 602 bytes)
• AvocadoVT-en.md (application/octet-stream — 734 bytes)
• Community-ch.md (application/octet-stream — 2.0 KB)
• Community-en.md (application/octet-stream — 2.1 KB)
• digest-list-tools-ch.md (application/octet-stream — 17.3 KB)
• digest-list-tools-en.md (application/octet-stream — 19.1 KB)