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

Everywhere.

Documentation problem

The default value in method signature and the default value in the method description is sometimes different.
Examples:

https://pandas.pydata.org/docs/reference/api/pandas.Series.replace.html:
does Series.replace's:
to_replace have None (docs signature) as default, or have no default (docs description)?
value have no default (docs signature), or None (docs description)?

https://pandas.pydata.org/docs/reference/api/pandas.read_csv.html:
does read_csv's:
sep have no default (docs signature), or ';' (docs description)?
...

...

Suggested fix for documentation

Fix.