DOC: Use backticks instead of quotes (#24744)

Daniel Saxton · jreback · commit 88a4170ef651 · 2019-01-13T13:58:02.000-05:00
diff --git a/doc/source/whatsnew/v0.24.0.rst b/doc/source/whatsnew/v0.24.0.rst
@@ -149,7 +149,7 @@ These dtypes can be merged & reshaped & casted.
    pd.concat([df[['A']], df[['B', 'C']]], axis=1).dtypes
    df['A'].astype(float)
 
-Reduction and groupby operations such as 'sum' work.
+Reduction and groupby operations such as ``sum`` work.
 
 .. ipython:: python
 
