Update what's new page with relevant issues for df.query() with in-place operator

The relevant issues added are :
BUG: query with invalid dtypes should fallback to python engine pandas-dev#10486
BUG: query modifies the frame when you compare with `=` pandas-dev#8664

Author: tsstchoi

Diff for: doc/source/whatsnew/v0.18.0.txt

@@ -785,7 +785,7 @@ 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