Moved period outside paren, where it belongs.
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index 23414dd..7412976 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -212,7 +212,7 @@
The :meth:`str.format` method and the :class:`Formatter` class share the same
syntax for format strings (although in the case of :class:`Formatter`,
-subclasses can define their own format string syntax.)
+subclasses can define their own format string syntax).
Format strings contain "replacement fields" surrounded by curly braces ``{}``.
Anything that is not contained in braces is considered literal text, which is