Documentation filters: 'add' arguments

[jeroenpeters1986]

Hi, it seems that the docs state that the filter add works like this: {{ value|add "2" }}

It returns an {# Error: Unknown filter ADD "2" #} on my end.
It does work in my project when I use it like this: {{ value|add:2 }}

My guess is is that this is incorrect in the docs, is that right?

[mmontone]

Yes. Some parts of the documentation is probably out of date. Thanks for the PR.

[jeroenpeters1986]

You're welcome! 👍