* 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