* Minor correction on safely drain node task
1. 'kubectl drain' command drains node and not a machine. So the machine word is replaced with node.
2. Also, add reference link to maintenance on a node task in what's next section
* Correcting link
Correcting link
* Define SLO acronym
Save people from having to search for the translation of SLO to Service-Level Objectives.
* replace SLO with direct PodDisruptionBudget reference
Kubernetes Prow Robot