Address Berker's comments from pythongh-271: move __len__ doc to class description

Erlend E. Aasland · Erlend E. Aasland · commit 69a5a1e24537 · 2022-04-15T00:54:05.000+02:00
diff --git a/Doc/library/sqlite3.rst b/Doc/library/sqlite3.rst
@@ -1112,7 +1112,8 @@ Blob Objects
 .. class:: Blob
 
    A :class:`Blob` instance is a :term:`file-like object` that can read and write
-   data in an SQLite :abbr:`BLOB (Binary Large OBject)`.
+   data in an SQLite :abbr:`BLOB (Binary Large OBject)`.  Call ``len(blob)`` to
+   get the size (number of bytes) of the blob.
 
    .. method:: close()
 
@@ -1122,10 +1123,6 @@ Blob Objects
       :class:`~sqlite3.Error` (or subclass) exception will be raised if any
       further operation is attempted with the blob.
 
-   .. method:: __len__()
-
-      Return the blob size in bytes.
-
    .. method:: read(length=-1, /)
 
       Read *length* bytes of data from the blob at the current offset position.
