🐛 signal: fix stubtest error in _bvalfromboundary (incorrect parameter name)

Author: jorenham

scipy-stubs/signal/_signaltools.pyi

@@ -106,15 +106,15 @@ def _valfrommode(mode: str) -> int: ...
 
 # undocumented
 @overload
-def _bvalfromboundary(mode: L["fill", "pad"]) -> L[0]: ...
+def _bvalfromboundary(boundary: L["fill", "pad"]) -> L[0]: ...
 @overload
-def _bvalfromboundary(mode: L["symm", "symmetric"]) -> L[4]: ...
+def _bvalfromboundary(boundary: L["symm", "symmetric"]) -> L[4]: ...
 @overload
-def _bvalfromboundary(mode: L["wrap", "circular"]) -> L[8]: ...
+def _bvalfromboundary(boundary: L["wrap", "circular"]) -> L[8]: ...
 @overload
-def _bvalfromboundary(mode: L["reflect"]) -> L[16]: ...
+def _bvalfromboundary(boundary: L["reflect"]) -> L[16]: ...
 @overload
-def _bvalfromboundary(mode: str) -> int: ...
+def _bvalfromboundary(boundary: str) -> int: ...
 
 #
 @overload