Minor: fix misleading comment in byte view (apache#6695)

* fix comment

Signed-off-by: jayzhan211 <jayzhan211@gmail.com>

* Update arrow-array/src/cast.rs

Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>

---------

Signed-off-by: jayzhan211 <jayzhan211@gmail.com>
Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>

arrow-array/src/cast.rs

@@ -778,34 +778,34 @@ pub trait AsArray: private::Sealed {
         self.as_bytes_opt().expect("binary array")
     }
 
-    /// Downcast this to a [`StringViewArray`] returning `None` if not possible
-    fn as_string_view(&self) -> &StringViewArray {
-        self.as_byte_view_opt().expect("string view array")
-    }
-
     /// Downcast this to a [`StringViewArray`] returning `None` if not possible
     fn as_string_view_opt(&self) -> Option<&StringViewArray> {
         self.as_byte_view_opt()
     }
 
-    /// Downcast this to a [`StringViewArray`] returning `None` if not possible
-    fn as_binary_view(&self) -> &BinaryViewArray {
-        self.as_byte_view_opt().expect("binary view array")
+    /// Downcast this to a [`StringViewArray`] panicking if not possible
+    fn as_string_view(&self) -> &StringViewArray {
+        self.as_byte_view_opt().expect("string view array")
     }
 
     /// Downcast this to a [`BinaryViewArray`] returning `None` if not possible
     fn as_binary_view_opt(&self) -> Option<&BinaryViewArray> {
         self.as_byte_view_opt()
     }
 
-    /// Downcast this to a [`GenericByteViewArray`] returning `None` if not possible
-    fn as_byte_view<T: ByteViewType>(&self) -> &GenericByteViewArray<T> {
-        self.as_byte_view_opt().expect("byte view array")
+    /// Downcast this to a [`BinaryViewArray`] panicking if not possible
+    fn as_binary_view(&self) -> &BinaryViewArray {
+        self.as_byte_view_opt().expect("binary view array")
     }
 
     /// Downcast this to a [`GenericByteViewArray`] returning `None` if not possible
     fn as_byte_view_opt<T: ByteViewType>(&self) -> Option<&GenericByteViewArray<T>>;
 
+    /// Downcast this to a [`GenericByteViewArray`] panicking if not possible
+    fn as_byte_view<T: ByteViewType>(&self) -> &GenericByteViewArray<T> {
+        self.as_byte_view_opt().expect("byte view array")
+    }
+
     /// Downcast this to a [`StructArray`] returning `None` if not possible
     fn as_struct_opt(&self) -> Option<&StructArray>;