Drop eight

Author: lukewarlow

index.bs

@@ -6802,7 +6802,7 @@ grammar symbol matches nearly any sequence of tokens, however the
 defined in this document only accept a more restricted syntax.
 Any extended attribute encountered in an
 [=IDL fragment=] is
-matched against the following eight grammar symbols to determine
+matched against the following grammar symbols to determine
 which form (or forms) it is in:
 
 <table class="vert data">