Merge pull request #1931 from jenkins-infra/daniel-beck-patch-1

Update 2018-12-05-security-updates.adoc

content/blog/2018/12/2018-12-05-security-updates.adoc

@@ -14,7 +14,7 @@ This allows administrators to install today's security fixes without having to u
 For an overview of what was fixed, see the link:/security/advisory/2018-12-05[security advisory].
 For an overview on the possible impact of these changes, see our link:/doc/upgrade-guide/2.138/#upgrading-to-jenkins-lts-2-138-4[LTS 2.138.4 upgrade guide].
 
-### A note on previously releases changes related to this fix
+### A note on previously released changes related to this fix
 
 In the Jenkins core security updates released in August and October, we also included security improvements that can be disabled by setting various system properties.
 Those changes are an essential part of the SECURITY-595 fix, so we strongly recommend not disabling them for any reason.