Remove extra > which shows in the built schemas (#1133)

src/metaschema/oscal_assessment-common_metaschema.xml

@@ -21,7 +21,7 @@
       <description>Used by the assessment plan and POA&amp;M to import information about the system.</description>
       <define-flag name="href" required="yes" as-type="uri-reference">
          <formal-name>System Security Plan Reference</formal-name>
-         <description>>A resolvable URL reference to the system security plan for the system being assessed.</description>
+         <description>A resolvable URL reference to the system security plan for the system being assessed.</description>
          <remarks>
             <p>The value of the <code>href</code> can be an internet resource, or a local reference using a fragment e.g. #fragment that points to a <code>back-matter</code> <code>resource</code> in the same document.</p>
             <p>If a local reference using a fragment is used, this will be indicated by a fragment "#" followed by an identifier which references an identified <code>resource</code> in the document's <code>back-matter</code> or another object that is <a href="/concepts/layer/assessment/assessment-plan/#key-concepts">within the scope of the containing OSCAL document</a>.</p>