fix braces

Author: luke396

pandas/io/excel/_base.py

@@ -267,7 +267,7 @@
     Rows at the end to skip (0-indexed).
 {storage_options}
 
-dtype_backend : {'numpy_nullable', 'pyarrow'}
+dtype_backend : {{'numpy_nullable', 'pyarrow'}}
     Back-end data type applied to the resultant :class:`DataFrame`
     (still experimental). If not specified, the default behavior
     is to not use nullable data types. If specified, the behavior

pandas/io/feather_format.py

@@ -92,7 +92,7 @@ def read_feather(
         Whether to parallelize reading using multiple threads.
     {storage_options}
 
-    dtype_backend : {'numpy_nullable', 'pyarrow'}
+    dtype_backend : {{'numpy_nullable', 'pyarrow'}}
         Back-end data type applied to the resultant :class:`DataFrame`
         (still experimental). If not specified, the default behavior
         is to not use nullable data types. If specified, the behavior

pandas/io/html.py

@@ -1131,7 +1131,7 @@ def read_html(
 
         .. versionadded:: 1.5.0
 
-    dtype_backend : {'numpy_nullable', 'pyarrow'}
+    dtype_backend : {{'numpy_nullable', 'pyarrow'}}
         Back-end data type applied to the resultant :class:`DataFrame`
         (still experimental). If not specified, the default behavior
         is to not use nullable data types. If specified, the behavior

pandas/io/json/_json.py

@@ -649,7 +649,7 @@ def read_json(
 
     {storage_options}
 
-    dtype_backend : {'numpy_nullable', 'pyarrow'}
+    dtype_backend : {{'numpy_nullable', 'pyarrow'}}
         Back-end data type applied to the resultant :class:`DataFrame`
         (still experimental). If not specified, the default behavior
         is to not use nullable data types. If specified, the behavior

pandas/io/parquet.py

@@ -542,7 +542,7 @@ def read_parquet(
 
         .. versionadded:: 1.3.0
 
-    dtype_backend : {'numpy_nullable', 'pyarrow'}
+    dtype_backend : {{'numpy_nullable', 'pyarrow'}}
         Back-end data type applied to the resultant :class:`DataFrame`
         (still experimental). If not specified, the default behavior
         is to not use nullable data types. If specified, the behavior

pandas/io/parsers/readers.py

@@ -443,7 +443,7 @@ class _read_shared(TypedDict, Generic[HashableT], total=False):
 
 {storage_options}
 
-dtype_backend : {'numpy_nullable', 'pyarrow'}
+dtype_backend : {{'numpy_nullable', 'pyarrow'}}
     Back-end data type applied to the resultant :class:`DataFrame`
     (still experimental). If not specified, the default behavior
     is to not use nullable data types. If specified, the behavior

pandas/io/xml.py

@@ -959,7 +959,7 @@ def read_xml(
 
     {storage_options}
 
-    dtype_backend : {'numpy_nullable', 'pyarrow'}
+    dtype_backend : {{'numpy_nullable', 'pyarrow'}}
         Back-end data type applied to the resultant :class:`DataFrame`
         (still experimental). If not specified, the default behavior
         is to not use nullable data types. If specified, the behavior