feat: Default to union operator for type hints

docs/cli-reference/base-options.md

@@ -62,14 +62,12 @@ For consistent cross-platform behavior, explicitly specify `--encoding utf-8`.
 
     from __future__ import annotations
 
-    from typing import Optional
-
     from pydantic import BaseModel, Field
 
 
     class 日本語Model(BaseModel):
-        名前: Optional[str] = Field(None, description='ユーザー名')
-        年齢: Optional[int] = None
+        名前: str | None = Field(None, description='ユーザー名')
+        年齢: int | None = None
     ```
 
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@@ -122,15 +120,13 @@ schemas. Required unless using `--url` to fetch schema from a URL.
 
     from __future__ import annotations
 
-    from typing import Optional
-
     from pydantic import BaseModel
 
 
     class Pet(BaseModel):
-        id: Optional[int] = None
-        name: Optional[str] = None
-        tag: Optional[str] = None
+        id: int | None = None
+        name: str | None = None
+        tag: str | None = None
     ```
 
 ---
@@ -236,15 +232,13 @@ is written to stdout.
 
     from __future__ import annotations
 
-    from typing import Optional
-
     from pydantic import BaseModel
 
 
     class Pet(BaseModel):
-        id: Optional[int] = None
-        name: Optional[str] = None
-        tag: Optional[str] = None
+        id: int | None = None
+        name: str | None = None
+        tag: str | None = None
     ```
 
 ---
@@ -298,15 +292,13 @@ Format: `HeaderName:HeaderValue`.
 
     from __future__ import annotations
 
-    from typing import Optional
-
     from pydantic import BaseModel
 
 
     class Pet(BaseModel):
-        id: Optional[int] = None
-        name: Optional[str] = None
-        tag: Optional[str] = None
+        id: int | None = None
+        name: str | None = None
+        tag: str | None = None
     ```
 
 ---