Update docs to reflect current state of template context.

[MerreM]

Params returns all of the parameters for the request, including both named params and query string parameters. These parameters are automatically available in templates as "{{.params}}".

Expecting ID, got: 'Sep{"."}'

Don't know what I'm doing wrong, but I suspect the docs need updating.

[markbates]

The docs do need updating. Where did you find that? Which doc?

[MerreM]

https://godoc.org/github.com/gobuffalo/buffalo#DefaultContext.Params