Fix duplicate index key.

Author: jduteau

xml/FHIR-us-breastcancerradiology.xml

@@ -382,7 +382,6 @@
    <page name="(NA)" key="NA"/>
    <page name="(many)" key="many"/>
    <page name="(profiles)" key="profiles" deprecated="true"/>
-   <page name="index" key="index" deprecated="true"/>
    <page name="Table of Contents" key="toc"/>
    <page name="Breast Radiology Reporting - 1st STU ballot" key="index"/>
    <page name="Background" key="background"/>