Louis Lim

fix-send-document-caption-optional: document caption is not required,…

1

The caption parameter is optional (https://developers.facebook.com/docs/whatsapp/cloud-api/reference/messages) Updated the sendDocument caption default value is empty, the caption is not a required parameter now.

### What type of PR is this (这是什么类型的PR) - [ ] Typo(勘误) - [ ] BUG(程序错误) - [x] Improvement(提升) - [ ] Feature(新特性) ### Which issue(s) this PR fixes(Optional) (这个PR...