Created by: tordans
Forms should show a error message whenever there is an error. This can be done nicely in bootstrap with the .text-help class. But until know people hat to figure that out by themselves.
This commit extends the example html with dummy error messages for the warning and danger cases. It also shows a case where a text-help paragraph is combined with an text-muted paragraph, wich requires an additional m-b-0 at the moment (see https://github.com/twbs/bootstrap/issues/18703).
In addition to that I extended the introduction to specify the .text-help class as the right way to show error messages in general. The .text-help is not explained in the form-docs yet, but it should.
This is what the new docs look like:
