Improved cylinder docstring.

Author: martinbudden

cadquery/cq.py

@@ -3832,7 +3832,7 @@ def cylinder(
         :return: A cylinder object for each point on the stack
 
         One cylinder is created for each item on the current stack. If no items are on the stack, one
-        cylinder using the current workplane center is created.
+        cylinder is created using the current workplane center.
 
         If combine is true, the result will be a single object on the stack. If a solid was found
         in the chain, the result is that solid with all cylinders produced fused onto it otherwise,