fixes in pyi

Author: fchapoton

src/sage/rings/function_field/element.pyi

@@ -1,7 +1,6 @@
 from typing import Any, List
 from sage.structure.element import FieldElement
 
-
 class FunctionFieldElement(FieldElement):
     _x: Any
     _matrix: Any

src/sage/rings/function_field/element_polymod.pyi

@@ -3,7 +3,6 @@ from sage.structure.richcmp import richcmp
 from sage.structure.element import FieldElement
 from sage.rings.function_field.element import FunctionFieldElement
 
-
 class FunctionFieldElement_polymod(FunctionFieldElement):
     def __init__(self, parent: Any, x: Any, reduce: bool = True) -> None:
         ...

src/sage/rings/function_field/element_rational.pyi

@@ -3,7 +3,6 @@ from sage.structure.richcmp import richcmp, richcmp_not_equal
 from sage.structure.element import FieldElement
 from sage.rings.function_field.element import FunctionFieldElement
 
-
 class FunctionFieldElement_rational(FunctionFieldElement):
     def __init__(self, parent: Any, x: Any, reduce: bool = True) -> None:
         ...

src/sage/symbolic/function_factory.pyi

@@ -4,7 +4,6 @@ from typing import Any
 
 from sage.symbolic.function import SymbolicFunction
 
-
 def function_factory(
     name: str,
     nargs: int = 0,
@@ -25,7 +24,6 @@ def function_factory(
 ) -> SymbolicFunction:
     ...
 
-
 def unpickle_function(
     name: str,
     nargs: int,
@@ -36,7 +34,6 @@ def unpickle_function(
 ) -> SymbolicFunction:
     ...
 
-
 def function(
     s: str,
     **kwds: Any