bpo-42755: Fix sqlite3.Connection.backup docs (GH-23965)

The `pages` argument default value now reflects the implementation.

diff --git a/Doc/library/sqlite3.rst b/Doc/library/sqlite3.rst
index c36648775a615ee0d1c0de69b8183de3737f8eac..950df60b2027defae00649020a6053936bfc1235 100644 (file)
--- a/Doc/library/sqlite3.rst
+++ b/Doc/library/sqlite3.rst
@@ -546,7 +546,7 @@ Connection Objects
          con.close()
 
 
-   .. method:: backup(target, *, pages=0, progress=None, name="main", sleep=0.250)
+   .. method:: backup(target, *, pages=-1, progress=None, name="main", sleep=0.250)
 
       This method makes a backup of a SQLite database even while it's being accessed
       by other clients, or concurrently by the same connection.  The copy will be