gh-118469: Document sqlite3.Binary in module constants

- Remove redundant second paragraph about DB-API 2.0 specification
- Change 'bytes objects' to 'bytes-like objects' for accuracy
- Add 'This is the current behavior' to clarify implementation status

Author: killerdevildog

Doc/library/sqlite3.rst

@@ -498,6 +498,16 @@ Module constants
 
       The ``named`` DB-API parameter style is also supported.
 
+.. data:: Binary
+
+   A type object used to describe columns containing :abbr:`BLOB (Binary Large OBject)` data.
+   Implemented as an alias for :class:`memoryview`.
+
+   .. note::
+
+      Binary data can also be stored and retrieved using bytes-like objects
+      directly without using :data:`!Binary`. This is the current behavior.
+
 .. data:: sqlite_version
 
    Version number of the runtime SQLite library as a :class:`string <str>`.