Fix typo in sqlite3 documentation (GH-19965)

*first* is repeated twice.
diff --git a/Doc/library/sqlite3.rst b/Doc/library/sqlite3.rst
index 314d3a5..ccb8227 100644
--- a/Doc/library/sqlite3.rst
+++ b/Doc/library/sqlite3.rst
@@ -928,7 +928,7 @@
            self.x, self.y = x, y
 
 Now you want to store the point in a single SQLite column.  First you'll have to
-choose one of the supported types first to be used for representing the point.
+choose one of the supported types to be used for representing the point.
 Let's just use str and separate the coordinates using a semicolon. Then you need
 to give your class a method ``__conform__(self, protocol)`` which must return
 the converted value. The parameter *protocol* will be :class:`PrepareProtocol`.