Clarify requirements for sb-certificate job

... as the joining host will reboot

Signed-off-by: Samuel Verschelde <[email protected]>

Author: stormi

jobs.py

@@ -270,7 +270,8 @@
         "description": "tests certificate propagation to disk by XAPI, and to VMs by uefistored/varstored",
         "requirements": [
             "A pool >= 8.2.1. On 8.3+, it needs at least two hosts. On 8.2, one is enough but more is better.",
-            "On 8.3+ only, a second pool, single-host, available for temporarily joining the first pool.",
+            "On 8.3+ only, a second pool, single-host, available for temporarily joining the first pool"
+            "and rebooting once ejected.",
             "A fast-booting unix UEFI VM with efitools.",
             "An additional free disk on the first host.",
         ],