move views to a separate bullet point from varbinary

Author: bkietz

docs/source/format/Columnar.rst

@@ -106,10 +106,12 @@ the different physical layouts defined by Arrow:
 * **Primitive (fixed-size)**: a sequence of values each having the
   same byte or bit width
 * **Variable-size Binary**: a sequence of values each having a variable
-  byte length. Three variants of this layout are supported using
-  * 32-bit offset encoding
-  * 64-bit offset encoding
-  * 128-bit view-or-inline encoding
+  byte length. Two variants of this layout are supported using 32-bit
+  and 64-bit length encoding.
+* **Views of Variable-size Binary**: a sequence of values each having a
+  variable byte length. In contrast to Variable-size Binary, the values
+  of this layout are distributed across potentially multiple buffers
+  instead of densely and sequentially packed in a single buffer.
 * **Fixed-size List**: a nested layout where each value has the same
   number of elements taken from a child data type.
 * **Variable-size List**: a nested layout where each value is a