Fix GUID/PGID mismatch in 7 more app guides missed by the earlier pass

content/en/3.serveex/4.monitoring/3.speedtest-tracker.md

@@ -56,7 +56,7 @@ services:
             - ${PORT}:80
         environment:
             - PUID=${PUID}
-            - PGID=${GUID}
+            - PGID=${PGID}
             - TZ=Europe/Paris
             - APP_KEY=${API_KEY}
             - DB_CONNECTION=sqlite
@@ -67,19 +67,19 @@ services:
 
 ### Set your environment variables
 
-Find your `PUID` and `GUID` by running the following command:
+Find your `PUID` and `PGID` by running the following command:
 
 ```bash [Terminal]
 id yourusername
 ```
 
-In the `.env` file, set the variable `API_KEY` with the key you generated and add a cron-style test schedule, as well as your `PUID` and `GUID`, for example:
+In the `.env` file, set the variable `API_KEY` with the key you generated and add a cron-style test schedule, as well as your `PUID` and `PGID`, for example:
 
 ```properties [.env]
 SCHEDULE=15 */6 * * * # every 6 hours
 API_KEY=base64:zihejehkj8_nzhY/OjeieR= # your key
 PUID=1000
-GUID=1000
+PGID=1000
 PORT=3225 # port to access the web UI
 ```