Fixed syntax of versionadded directive

wouterj · web-flow · commit 30febcfe5c2b · 2020-05-16T12:13:03.000+02:00
diff --git a/components/string.rst b/components/string.rst
@@ -512,7 +512,7 @@ the injected slugger is the same as the request locale::
 Inflector
 ---------
 
-..versionadded:: 5.1
+.. versionadded:: 5.1
 
     The inflector feature was introduced in Symfony 5.1.
 
