Update the releng index page and 10.4R schedule to reflect stable/10

is frozen for the 10.4-RELEASE cycle.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation

en_US.ISO8859-1/htdocs/releases/10.4R/schedule.xml

@@ -73,7 +73,7 @@
     <tr>
       <td>Code freeze begins</td>
       <td>11&nbsp;August&nbsp;2017</td>
-      <td>-</td>
+      <td>11&nbsp;August&nbsp;2017</td>
       <td>Release Engineers announce that all further commits to the
 	&local.branch.stable; branch will require explicit approval.
 	Certain blanket approvals will be granted for narrow areas of

en_US.ISO8859-1/htdocs/releng/index.xml

@@ -105,8 +105,8 @@
 
     <tr>
       <td><tt>stable/10</tt></td>
-      <td>Open</td>
-      <td>committers</td>
+      <td>Frozen</td>
+      <td>&contact.re;</td>
       <td>Development branch for FreeBSD 10-STABLE.</td>
     </tr>