added build generated obs-summary page

Author: healthedata1

xml/FHIR-us-core.xml

@@ -466,6 +466,7 @@
 <page key="medication-list" name="Medication List"/>
 <page deprecated="true" key="all-meds" name="Medication List Guidance"/>
 <page key="must-support" name="Must Support"/>
+<page key="observation-summary" name="Observation Summary Table"/>
 <page key="profiles" name="Profiles and Extensions"/>
 <page deprecated="true" key="schemas-schematrons" name="Schemas &amp; Schematrons"/>
 <page key="searchparameters" name="Search Parameters and Operations"/>