DOC: Use backticks instead of quotes (pandas-dev#24744)

Daniel Saxton · Pingviinituutti · commit 05140d8bd981 · 2019-02-28T10:19:16.000+02:00
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
 
