Added example of member function usage for dateAdd()

[homestar9]

@pfreitag, it looks like the following failed: "Failure: dateadd.json example result is:Will return a timestamp for tomorrow but evaluated to:{ts '2022-10-04 14:46:20'}. Expected [Will return a timestamp for tomorrow] Actual [{ts '2022-10-04 14:46:20'}]" I believe this is because I wrote the example to use now(). Would you prefer I use a static date for the docs instead?

[pfreitag]

Yeah @homestar9 - if you can use a static date that would be perfect. Thanks!!

[pfreitag]

Thanks @homestar9