fix: replace broken links

docs/Using GreptimeDB in Grafana.md

@@ -8,7 +8,7 @@ Get GreptimeDB from [Greptime's release page here](https://github.com/GreptimeTe
 
 This plugin is currently campatiable with GreptimeDB 0.1.1-alpha.
 
-For demostration, run it in standalone mode `./greptime standalone start`. In case of port conflicts, start with option `-c <config.toml>`. The format of `config.toml` [can be found here](https://docs.greptime.com/reference/configuration)
+For demostration, run it in standalone mode `./greptime standalone start`. In case of port conflicts, start with option `-c <config.toml>`. The format of `config.toml` [can be found here](https://docs.greptime.com/user-guide/operations/configuration)
 
 ### Docker
 

src/README.md

@@ -20,7 +20,7 @@ Get GreptimeDB from [Greptime's release page here](https://github.com/GreptimeTe
 
 This plugin is currently campatiable with GreptimeDB 0.1.1-alpha.
 
-For demostration, run it in standalone mode `./greptime standalone start`. In case of port conflicts, start with option `-c <config.toml>`. The format of `config.toml` [can be found here](https://docs.greptime.com/reference/configuration)
+For demostration, run it in standalone mode `./greptime standalone start`. In case of port conflicts, start with option `-c <config.toml>`. The format of `config.toml` [can be found here](https://docs.greptime.com/user-guide/operations/configuration)
 
 ### Docker
 

src/datasource.ts

@@ -66,8 +66,8 @@ export class DataSource extends DataSourceApi<GreptimeQuery, GreptimeSourceOptio
       } else {
         return {
           status: 'error',
-          message: `Error code ${response.code}. 
-          See https://docs.greptime.com/user-guide/supported-protocols/http-api#result-codes-table for more details`,
+          message: `Greptime error code ${response.code}. 
+          See https://github.com/GreptimeTeam/greptimedb/blob/develop/src/common/error/src/status_code.rs for more details`,
         };
       }
     } catch (err) {