Pick up doc update

Some docs are generated based on the k8s-snap-api docstrings.

We've just bumped the k8s-snap-api version and the docs are out of
sync because of a spelling fix. To fix the docs CI job, we need
to apply this fix here as well.

In the future, we may want to remove automatically generated docs
from the Github repo.

docs/src/_parts/bootstrap_config.md

@@ -189,7 +189,7 @@ If omitted defaults to `true`.
 Sets the cloud provider to be used by the cluster.
 
 When this is set as `external`, node will wait for an external cloud provider to
-do cloud specific setup and finish node initialization.
+do cloud specific setup and finish node initialisation.
 
 Possible values: `external`.