doc: fix minor typo in vuln announce (#1707)

Author: mhdawson

locale/en/blog/vulnerability/june-2018-security-releases.md

@@ -90,7 +90,7 @@ Node.js will release new versions of all supported release lines on or around Ju
 ## Impact
 
 * All versions of Node.js 6.x (LTS "Boron") are vulnerable to 1 denial-of-service (DoS) vulnerability with a severity of LOW.
-* All versions of Node.js 8.x (LTS "Carbon") are vulnerable to 2 denial-of-service (DoS) vulnerabilities, the highest severity being HIGH (**Node** This should have said 3).
+* All versions of Node.js 8.x (LTS "Carbon") are vulnerable to 2 denial-of-service (DoS) vulnerabilities, the highest severity being HIGH (**Note** This should have said 3).
 * Versions of Node.js 9.x are vulnerable to 5 denial-of-service (DoS) vulnerabilities, the highest severity being HIGH.
 * All versions of Node.js 10.x (Current) are vulnerable to 4 denial-of-service (DoS) vulnerabilities, the highest severity being HIGH.