Update trim_zeros annotation in stub file

Author: lagru

numpy/lib/_function_base_impl.py

@@ -1911,7 +1911,7 @@ def trim_zeros(filt, trim='fb', axis=-1):
     ----------
     filt : array_like
         Input array.
-    trim : str, optional
+    trim : {"fb", "f", "b"}, optional
         A string with 'f' representing trim from front and 'b' to trim from
         back. By default, zeros are trimmed from the front and back.
     axis : int or sequence, optional

numpy/lib/_function_base_impl.pyi

@@ -316,6 +316,7 @@ def sort_complex(a: ArrayLike) -> NDArray[complexfloating[Any, Any]]: ...
 def trim_zeros(
     filt: _TrimZerosSequence[_T],
     trim: L["f", "b", "fb", "bf"] = ...,
+    axis: SupportsIndex = ...,
 ) -> _T: ...
 
 @overload