fixup update instructions

Author: ukkopahis

docs/Updating-the-Project.md

@@ -8,9 +8,22 @@ Quick instructions:
 2. check `git status` for any local changes you may have made to project files. Save and preserve your changes by doing a commit: `git commit -a -m "local customization"`. Or revert them using: `git checkout -- path/to/changed_file`.
 3. update project files from github: `git pull origin master -r`
 4. get latest images from the web: `docker-compose pull`
-5. rebuild localy created images from new Dockerfiles: `docker-compose build --pull`
-6. update containers to latest: `docker-compose up --build -d`
-7. **optional**, needed if something won't start after the rest of the steps - to update docker-compose.yml with new definitions for a container: open `./menu.sh`, select Build Stack, unselect and then reselect the container causing the issue, and then build by presing enter. Check if this fixed your issue: `docker-compose up -d`
+5. rebuild localy created images from new Dockerfiles: `docker-compose build --pull --no-cache`
+6. update running containers to latest: `docker-compose up --build -d`
+
+*Troubleshooting:* if a container fails to restart after update
+* try restarting the whole stack: `docker-compose restart`
+* Check log output of the failing service: `docker-compose logs *service-name*`
+* try googling and fixing problems in docker-compose.yml manually. 
+* backup your docker-compose.yml and try recreating the failing service
+  definition using menu.sh:
+  * `cp docker-compose.yml docker-compose.yml.bak`
+  * `./menu.sh`, select Build Stack, unselect the failing service, press enter
+	to build, and then exit.
+  * `./menu.sh`, select Build Stack, select the service back again, press enter
+	to build, and then exit.
+  * Try starting now: `docker-compose up -d`
+* Go to the IOTStack Discord and ask for help.
 
 ## Details, partly outdated