DOC: misc sphinx directive fixes (#34960)

Author: simonjayhawkins

pandas/core/common.py

@@ -404,7 +404,7 @@ def random_state(state=None):
         If receives `None`, returns np.random.
         If receives anything else, raises an informative ValueError.
 
-        ..versionchanged:: 1.1.0
+        .. versionchanged:: 1.1.0
 
             array-like and BitGenerator (for NumPy>=1.18) object now passed to
             np.random.RandomState() as seed

pandas/core/frame.py

@@ -8213,7 +8213,7 @@ def cov(
             Delta degrees of freedom.  The divisor used in calculations
             is ``N - ddof``, where ``N`` represents the number of elements.
 
-            versionadded:: 1.1.0
+            .. versionadded:: 1.1.0
 
         Returns
         -------

pandas/core/generic.py

@@ -4809,7 +4809,7 @@ def sample(
             random number generator
             If np.random.RandomState, use as numpy RandomState object.
 
-            ..versionchanged:: 1.1.0
+            .. versionchanged:: 1.1.0
 
                 array-like and BitGenerator (for NumPy>=1.17) object now passed to
                 np.random.RandomState() as seed

pandas/core/series.py

@@ -2342,7 +2342,7 @@ def cov(
             Delta degrees of freedom.  The divisor used in calculations
             is ``N - ddof``, where ``N`` represents the number of elements.
 
-            versionadded:: 1.1.0
+            .. versionadded:: 1.1.0
 
         Returns
         -------

pandas/plotting/_core.py

@@ -67,7 +67,7 @@ def hist_series(
     legend : bool, default False
         Whether to show the legend.
 
-        ..versionadded:: 1.1.0
+        .. versionadded:: 1.1.0
 
     **kwargs
         To be passed to the actual plotting function.
@@ -179,7 +179,7 @@ def hist_frame(
     legend : bool, default False
         Whether to show the legend.
 
-        ..versionadded:: 1.1.0
+        .. versionadded:: 1.1.0
 
     **kwargs
         All other plotting keyword arguments to be passed to