Fix linter (#20389)

Author: jorisvandenbossche

pandas/_libs/tslibs/period.pyx

@@ -1355,7 +1355,7 @@ cdef class _Period(object):
 
         Returns
         -------
-        int 
+        int
 
         See Also
         --------
@@ -1371,7 +1371,7 @@ cdef class _Period(object):
         >>> p = pd.Period("2018-02-01", "D")
         >>> p.week
         5
-        
+
         >>> p = pd.Period("2018-01-06", "D")
         >>> p.week
         1