DOC: Improve now() by adding examples

[ThermodynamicBeta]

Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Timestamp.now.html

Documentation problem

Explain what are valid strings for this (IANA time zones presumably, not sure if anything else)

Suggested fix for documentation

Sorry no time

[liudehua777]

Hi! I'm a student learning open source contribution, I'd like to work on this issue.

[arturkenzo]

Hello I'm taking a look at this issue.