Fix column C spacing

Author: Moisan

pandas/core/groupby/groupby.py

@@ -2322,7 +2322,7 @@ def first(self, numeric_only: bool = False, min_count: int = -1):
 
         Examples
         --------
-        >>> df = pd.DataFrame(dict(A=[1, 1, 3], B=[None, 5, 6], C=[1,2,3],
+        >>> df = pd.DataFrame(dict(A=[1, 1, 3], B=[None, 5, 6], C=[1, 2, 3],
         ...                        D=['3/11/2000', '3/12/2000', '3/13/2000']))
         >>> df['D'] = pd.to_datetime(df['D'])
         >>> df.groupby("A").first()