Remove new line after params in operation docstrings

Author: arandito

codegen/core/src/main/java/software/amazon/smithy/python/codegen/ClientGenerator.java

@@ -168,8 +168,7 @@ private void writeSharedOperationInit(PythonWriter writer, OperationShape operat
             writer.write("""
                     :param plugins: A list of callables that modify the configuration dynamically.
                         Changes made by these plugins only apply for the duration of the operation
-                        execution and will not affect any other operation invocations.
-                        """);
+                        execution and will not affect any other operation invocations.""");
 
         });