docs(Grafana): add more variables docs for Grafana

Ref [TD-16448](https://jira.taosdata.com:18080/browse/TD-16448)

docs-cn/20-third-party/01-grafana.mdx

@@ -38,6 +38,16 @@ export TDENGINE_API=http://tdengine.local:6041
 # user + password
 export TDENGINE_USER=user
 export TDENGINE_PASSWORD=password
+
+# 其他环境变量：
+# - 是否安装数据源，默认为 true，表示安装
+export TDENGINE_DS_ENABLED=false
+# - 数据源名称，默认为 TDengine
+export TDENGINE_DS_NAME=TDengine
+# - 数据源所属组织 ID，默认为 1
+export GF_ORG_ID=1
+# - 数据源是否可通过管理面板编辑，默认为 0，表示不可编辑
+export TDENGINE_EDITABLE=1
 ```
 
 运行安装脚本：
@@ -48,6 +58,8 @@ bash -c "$(curl -fsSL https://raw.githubusercontent.com/taosdata/grafanaplugin/m
 
 该脚本将自动安装 Grafana 插件并配置数据源。安装完毕后，需要重启 Grafana 服务后生效。
 
+保存该脚本并执行 `./install.sh --help` 可查看详细帮助文档。
+
 </TabItem>
 <TabItem value="manual" label="手动安装并配置">
 

docs-en/20-third-party/01-grafana.mdx

@@ -40,6 +40,16 @@ export TDENGINE_API=http://tdengine.local:6041
 # user + password
 export TDENGINE_USER=user
 export TDENGINE_PASSWORD=password
+
+# Other useful variables
+# - If to install TDengine data source, default is true
+export TDENGINE_DS_ENABLED=false
+# - Data source name to be created, default is TDengine
+export TDENGINE_DS_NAME=TDengine
+# - Data source organization id, default is 1
+export GF_ORG_ID=1
+# - Data source is editable in admin ui or not, default is 0 (false)
+export TDENGINE_EDITABLE=1
 ```
 
 Run `install.sh`:
@@ -48,7 +58,7 @@ Run `install.sh`:
 bash -c "$(curl -fsSL https://raw.githubusercontent.com/taosdata/grafanaplugin/master/install.sh)"
 ```
 
-With this script, TDengine data source plugin and the Grafana data source will be installed and created automatically with Grafana provisioning configurations.
+With this script, TDengine data source plugin and the Grafana data source will be installed and created automatically with Grafana provisioning configurations. Save the script and type `./install.sh --help` for the full usage of the script.
 
 And then, restart Grafana service and open Grafana in web-browser, usually <http://localhost:3000>.