sqlite3: Port relevant documentation changes from 3.2

Initial patch by Johannes Vogel. Issue #13491.
diff --git a/Misc/NEWS b/Misc/NEWS
index 6b3fbc2..bea3571 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -613,7 +613,8 @@
 Documentation
 -------------
 
-- Issue #13995: Fix errors in sqlite3's Cursor.rowcount documentation
+- Issues #13491 and #13995: Fix many errors in sqlite3 documentation.
+  Initial patch for #13491 by Johannes Vogel.
 
 - Issue #13402: Document absoluteness of sys.executable.