fix cut and paste in table

Author: bcumming

docs/guides/gb25.md

@@ -8,7 +8,7 @@ This is temporary documentation for the Gordon Bell second round benchmark runs
 | ---   | ---- | ----- | --------------------- |
 | -     | 08-15| 08:00 | Daint is reconfigured and resized for GB runs             |
 | all   | 08-15| ASAP  | Daint is available to all teams for final testing at scale |
-| `g???`| 08-15| 18:00 | Daint is available to all teams for final testing at scale |
+| `g???`| 08-15| 18:00 | First team runs |
 
 ## System