Document "symbols" naming style in object_name_linter

[hedsnz]

The documentation for object_name_linter describes:

... The default naming styles are "snake_case" and "symbols".

After that, there is no explanation of what "symbols" means, and there is no example that uses styles = "symbols". Could this documentation please be added?

Thanks

[luma-sb]

I was recently asked by my team what the "symbols" style for object_name_linter linter did - so did some digging and hit same issue as you @hedsnz . Appears this was introduced to resolve issue #615 which provides helpful examples to demonstrate applicable cases.

[AshesITR]

Not sure where to document the regexes, but I would describe "symbols" as function names containing only non-alphanumeric characters, e.g., `%+%` from ggplot2 or `%>%` from magrittr.