doc: ReSTify keys-trusted-encrypted.txt

Adjusts for ReST markup and moves under keys security devel index.

Cc: David Howells <dhowells@redhat.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

security/keys/encrypted-keys/encrypted.c

@@ -11,7 +11,7 @@
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, version 2 of the License.
  *
- * See Documentation/security/keys-trusted-encrypted.txt
+ * See Documentation/security/keys/trusted-encrypted.rst
  */
 
 #include <linux/uaccess.h>

security/keys/encrypted-keys/masterkey_trusted.c

@@ -11,7 +11,7 @@
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, version 2 of the License.
  *
- * See Documentation/security/keys-trusted-encrypted.txt
+ * See Documentation/security/keys/trusted-encrypted.rst
  */
 
 #include <linux/uaccess.h>

security/keys/trusted.c

@@ -8,7 +8,7 @@
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, version 2 of the License.
  *
- * See Documentation/security/keys-trusted-encrypted.txt
+ * See Documentation/security/keys/trusted-encrypted.rst
  */
 
 #include <crypto/hash_info.h>