DOC: Update what's new page with relevant issues for df.query() with in-pl…

closes #10486

Author: Steve Choi <[email protected]>

Closes #12456 from tsstchoi/inplace_doc and squashes the following commits:

414e30f [Steve Choi] Update what's new page with relevant issues for df.query() with in-place operator

Author: tsstchoi

doc/source/whatsnew/v0.18.0.txt

@@ -904,7 +904,7 @@ Changes to eval
 ^^^^^^^^^^^^^^^
 
 In prior versions, new columns assignments in an ``eval`` expression resulted
-in an inplace change to the ``DataFrame``. (:issue:`9297`)
+in an inplace change to the ``DataFrame``. (:issue:`9297`, :issue:`8664`, :issue:`10486`)
 
 .. ipython:: python