Update hips/hip-9999.md

Co-authored-by: Andreas Lindhé <[email protected]>
Signed-off-by: gerrnot <[email protected]>

Author: gerrnot

hips/hip-9999.md

@@ -26,7 +26,7 @@ There are two known situations how the user can run into such a situation where
 Known Workarounds that should become OBSOLETE when this HIP is implemented to recover from such situations:
 1. `kubectl delete secret '<the name of the secret where helm stores release information>'.` (Not possible if you don't want to lose all history)
 2. `helm delete` your release. (Not possible if you don't want to lose all history)
-3. `helm rollback` your release. (Not possibly if it is the first installation)
+3. `helm rollback` your release. (Not possible if it is the first installation)
 
 ## Rationale