Committer guide: expand ports-secteam blanket

This approves two additional blankets:
- security issues version bumps
- crash version bumps

Reviewed by:	feld
With hat:	ports-secteam

en_US.ISO8859-1/articles/committers-guide/article.xml

@@ -4433,6 +4433,11 @@ Relnotes:           yes</programlisting>
 		  adding a patch fixing a buffer overflow.</para>
 	      </listitem>
 
+	      <listitem>
+		<para>Minor version changes that do nothing but fix
+		  security or crash-related issues.</para>
+	      </listitem>
+
 	      <listitem>
 		<para>Adding/fixing
 		  <varname>CONFLICTS</varname>.</para>