* Improve init containers page
- Overall rewording
- Link to “Debug init containers” in whatsnext
- Explain terms / use glossary references
- Use glossary shortcodes where appropriate
- Expand terms like QoS and cgroup that aren't in the glossary
- Only document & recommend stable syntax
- Tweak initContainer examples to use project style
- Drop vestigialreference to StatefulSet
Also: write “container” in lower case
Most of the places where this page talks about containers, it's as a
concept rather than an object in the Kubernetes API. Adjust case
accordingly.
* Reword what's next section
Tim Bannister
e1ec9a6246