Extend troubleshooting section

Author: Overv

README.md

@@ -49,12 +49,12 @@ You can find an example of the import performance to expect with this image on t
 
 ## Troubleshooting
 
-### ERROR: could not resize shared memory segment
+### ERROR: could not resize shared memory segment / No space left on device
 
 If you encounter such entries in the log, it will mean that the default shared memory limit (64 MB) is too low for the container and it should be raised:
 
-    renderd[126]: ERROR: failed to render TILE ajt 6 32-39 16-23,
-    renderd[126]: reason: Postgis Plugin: ERROR: could not resize shared memory segment
+    renderd[121]: ERROR: failed to render TILE ajt 2 0-3 0-3
+    renderd[121]: reason: Postgis Plugin: ERROR: could not resize shared memory segment "/PostgreSQL.790133961" to 12615680 bytes: ### No space left on device
 
 To raise it use `--shm-size` parameter. For example: