Update cyclic() docstring summary to include 'get' aspect

Author: sadielbartholomew

cf/mixin/fielddomain.py

@@ -1909,7 +1909,7 @@ def coordinate_reference_domain_axes(self, identity=None):
     def cyclic(
         self, *identity, iscyclic=True, period=None, config={}, **filter_kwargs
     ):
-        """Set the cyclicity of an axis.
+        """Get or set the cyclicity of an axis.
 
         .. versionadded:: 1.0
 

cf/mixin/propertiesdata.py

@@ -2934,7 +2934,7 @@ def count_masked(self):
         return data.count_masked()
 
     def cyclic(self, axes=None, iscyclic=True):
-        """Set the cyclicity of an axis.
+        """Get or set the cyclicity of an axis.
 
         .. seealso:: `iscyclic`
 

cf/mixin/propertiesdatabounds.py

@@ -1607,7 +1607,7 @@ def cos(self, bounds=True, inplace=False, i=False):
         )
 
     def cyclic(self, axes=None, iscyclic=True):
-        """Set the cyclicity of axes of the data array.
+        """Get or set the cyclicity of axes of the data array.
 
         .. seealso:: `iscyclic`