intro-user.txt: fix formatting of section "Security Fixes"
Release-Notes: skip
Change-Id: I066af14229780b6508ad73648577d3f0bcd1a64e
diff --git a/Documentation/intro-user.txt b/Documentation/intro-user.txt
index 264ce73..7a042ba 100644
--- a/Documentation/intro-user.txt
+++ b/Documentation/intro-user.txt
@@ -1014,7 +1014,7 @@
inline comment ("Yeah, I see why, let me try again.").
[[security-fixes]]
--- Security Fixes
+== Security Fixes
If a security vulnerability is discovered you normally want to have an
embargo about it until fixed releases have been made available. This
