DOC-10371 Add note regarding supported interpolation methods for Series/DF
Closes #10371

Suggested improvement for https://github.com/pydata/pandas/issues/10371

Looks good! 
About the formatting, for me this is good as well, or otherwise make it look like code with ```method='linear'```
 Thanks @jorisvandenbossche!
Incorporated your suggestions.
Local build of the docstring looks ok.
 Yep, looks good. Can you just squash the two commits into one? 
 Sounds like a recipe for one of my famous git disasters, but I'll give it a go.
 it is totally not difficult :-), just `git rebase -i master` and then force push
 Merging now, thanks a lot!
 @jorisvandenbossche did the squashing really work?  Wow, that must be the first time I do something like that in git without borking a million other files at the same time! Thanks!
 I don't know _what_ exactly you did, but in any case, it was OK! 
BTW, really nice to see contribution to the docs! Hopefully there will follow some more :-)
