docs(catch): fix the description of the selector param
docs(catch): fix the description of the selector param

SangKa/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,SangKa/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,SangKa/RxJS-Docs-CN,SangKa/RxJS-Docs-CN