Core: Link to Hypermedia section instead

Author: awwright

jsonschema-core.xml

@@ -721,7 +721,7 @@
                     <t>
                         When schemas are downloaded,
                         for example by a generic user-agent that doesn't know until runtime which schemas to download,
-                        see <xref target="http-usage">Usage over HTTP</xref>.
+                        see <xref target="hypermedia">Usage for Hypermedia</xref>.
                     </t>
                     <t>
                         Implementations SHOULD be able to associate arbitrary URIs with an arbitrary
@@ -835,7 +835,7 @@
             </t>
         </section>
 
-        <section title="Usage for Hypermedia">
+        <section title="Usage for Hypermedia" anchor="hypermedia">
 
             <t>
                 JSON has been adopted widely by HTTP servers for automated APIs and robots. This
@@ -936,7 +936,7 @@ Link: </alice>;rel="schema", </bob>;rel="schema"
 
             </section>
 
-             <section title="Usage Over HTTP" anchor="http-usage">
+             <section title="Usage Over HTTP">
                 <t>
                     When used for hypermedia systems over a network,
                     <xref target="RFC7231">HTTP</xref> is frequently the protocol of choice for