Add specref entry for BBC Subtitle Guidelines

index.html

@@ -74,12 +74,6 @@
             publisher: "HbbTV Association",
             date: "2018"
           },
-          "BBC-SUBTITLES": {
-            title: "Subtitle Guidelines",
-            href: "http://bbc.github.io/subtitle-guidelines/",
-            publisher: "BBC",
-            date: "May 2018"
-          },
           "3GPP-INTERACTIVITY-WID": {
             title: "SP-170796: New WID on 3GPP Service Interactivity",
             href: "http://www.3gpp.org/ftp/tsg_sa/TSG_SA/TSGS_77/Docs/SP-170796.zip",
@@ -244,7 +238,7 @@ <h3>Subtitle and caption rendering synchronization</h3>
         <p>
           A subtitle or caption author wants ensure that subtitle changes are
           aligned as closely as possible to shot changes in the video.
-          The BBC Subtitle Guidelines [[BBC-SUBTITLES]] describes authoring
+          The BBC Subtitle Guidelines [[BBC-SUBTITLE]] describes authoring
           best practices. In particular, in section 6.1 authors are advised
           "it is likely to be less tiring for the viewer if shot changes
           and subtitle changes occur at the same time. Many subtitles therefore