Fix deprecation of errors in TextConfig (#6095)

* Fix deprecation of errors in TextConfig

* Fix typo in warning message

src/datasets/packaged_modules/text/text.py

@@ -1,6 +1,6 @@
 import itertools
 import warnings
-from dataclasses import dataclass
+from dataclasses import InitVar, dataclass
 from io import StringIO
 from typing import Optional
 
@@ -20,20 +20,20 @@ class TextConfig(datasets.BuilderConfig):
 
     features: Optional[datasets.Features] = None
     encoding: str = "utf-8"
-    errors = "deprecated"
+    errors: InitVar[Optional[str]] = "deprecated"
     encoding_errors: Optional[str] = None
     chunksize: int = 10 << 20  # 10MB
     keep_linebreaks: bool = False
     sample_by: str = "line"
 
-    def __post_init__(self):
-        if self.errors != "deprecated":
+    def __post_init__(self, errors):
+        if errors != "deprecated":
             warnings.warn(
-                "'errors' was deprecated in favor of 'encoding_erros' in version 2.14.0 and will be removed in 3.0.0.\n"
-                f"You can remove this warning by passing 'encoding_errors={self.errors}' instead.",
+                "'errors' was deprecated in favor of 'encoding_errors' in version 2.14.0 and will be removed in 3.0.0.\n"
+                f"You can remove this warning by passing 'encoding_errors={errors}' instead.",
                 FutureWarning,
             )
-            self.encoding_errors = self.errors
+            self.encoding_errors = errors
 
 
 class Text(datasets.ArrowBasedBuilder):