Fixed a link

Author: javiereguiluz

reference/configuration/framework.rst

@@ -3640,4 +3640,4 @@ to know their differences.
 .. _`Microsoft NTLM authentication protocol`: https://docs.microsoft.com/en-us/windows/win32/secauthn/microsoft-ntlm
 .. _`utf-8 modifier`: https://www.php.net/reference.pcre.pattern.modifiers
 .. _`Link HTTP header`: https://tools.ietf.org/html/rfc5988
-_ ..`establishment of the SMTP session`: https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#SMTP_transport_example
+.. _`establishment of the SMTP session`: https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol#SMTP_transport_example