enhance unetr docstring with examples

[wyli]

Discussed in #2547

^{Originally posted by jhkang0526 July 7, 2021}
hello,

I recently saw about the UNETR.

Is it currently possible to apply to 3D data?

If possible, how should I use it?

Thanks,

[Nic-Ma]

Hi @ahatamiz ,

Thanks for providing the nice UNETR feature in MONAI v0.6.
Could you please help self-assign this ticket?

Thanks in advance.

[ahatamiz]

Hi @Nic-Ma
Sure, however I don't think I have been given permission to self-assign. I don't see the option yet. Would you mind provide that permission ?

I will submit a new PR regarding this.

Thanks,
Ali

[Nic-Ma]

Hi @ahatamiz ,

I assigned the ticket to you.

Thanks in advance.

[ahatamiz]

Thank you @Nic-Ma