Update macOS install command (#21507)

Co-authored-by: Lunny Xiao <[email protected]>

Author: RainboWu

docs/content/doc/installation/from-package.zh-cn.md

@@ -71,7 +71,7 @@ choco install gitea
 macOS 平台下当前我们仅支持通过 `brew` 来安装。如果你没有安装 [Homebrew](http://brew.sh/)，你也可以查看 [从二进制安装]({{< relref "from-binary.zh-cn.md" >}})。在你安装了 `brew` 之后， 你可以执行以下命令：
 
 ```
-brew tap go-gitea/gitea
+brew tap gitea/tap https://gitea.com/gitea/homebrew-gitea
 brew install gitea
 ```