📖 docs: Update docs for NewPath (#9462)

pydantic/types.py

@@ -1334,7 +1334,7 @@ class Model(BaseModel):
 ```
 """
 NewPath = Annotated[Path, PathType('new')]
-"""A path for a new file or directory that must not already exist."""
+"""A path for a new file or directory that must not already exist. The parent directory must already exist."""
 
 
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ JSON TYPE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~