Copy-paste typo correction for error

Author: benrutter

narwhals/_arrow/namespace.py

@@ -256,7 +256,7 @@ def _if_then_else(
 
     def corr(self, a: ArrowExpr, b: ArrowExpr, *, method: CorrMethod) -> ArrowExpr:
         if method != "pearson":
-            msg = "Only 'pearson' correlation is supported for Spark."
+            msg = "Only 'pearson' correlation is supported for Pyarrow."
             raise NotImplementedError(msg)
 
         def func(df: ArrowDataFrame) -> list[ArrowSeries]:

narwhals/_ibis/namespace.py

@@ -145,7 +145,7 @@ def func(_df: IbisLazyFrame) -> list[ir.Value]:
 
     def corr(self, a: IbisExpr, b: IbisExpr, *, method: CorrMethod) -> IbisExpr:
         if method != "pearson":
-            msg = "Only 'pearson' correlation is supported for Spark."
+            msg = "Only 'pearson' correlation is supported for Ibis."
             raise NotImplementedError(msg)
 
         def func(_df: IbisLazyFrame) -> list[ir.Value]: