Update `template.md` to include optional `When to use`, and `Dos and Don'ts` section
Originally discussed on !1763 (comment 309795213):
On Pajamas guidelines, there are usually sections for When to use or When not to use a component as well as Dos and Dont’s in different formats.
These sections are also missing from some of the existing documentation and template.md
and sometimes are not applicable. I would love to see these sections homogenized which will strengthen component documentation structure and more.