* docs(example_init): consistently use `:h`
* docs(example_init): align PLUGINS section with the overall style
Since this entire file is example, all sections use declarative voice,
avoiding "For example".
Replaces summary list with related help tags.
* docs(example_init): adjust mini.completion URI
See https://github.com/nvim-mini/mini.nvim/discussions/1970
* docs(example_init): misc grammar fix
Problem:
There are some "boilerplate" steps for new users. Although we are
constantly improving defaults and lifting patterns into core, users
eventually want to know how to start their own config, add plugins, etc.
Solution:
Add `runtime/example_init.lua` and refer to it from docs.
