docs: crypto: convert asymmetric-keys.txt to ReST

This file is almost compatible with ReST. Just minor changes
were needed:

- Adjust document and titles markups;
- Adjust numbered list markups;
- Add a comments markup for the Contents section;
- Add markups for literal blocks.

Acked-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/c2275ea94e0507a01b020ab66dfa824d8b1c2545.1592203650.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

include/keys/asymmetric-parser.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /* Asymmetric public-key cryptography data parser
  *
- * See Documentation/crypto/asymmetric-keys.txt
+ * See Documentation/crypto/asymmetric-keys.rst
  *
  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)

include/keys/asymmetric-subtype.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /* Asymmetric public-key cryptography key subtype
  *
- * See Documentation/crypto/asymmetric-keys.txt
+ * See Documentation/crypto/asymmetric-keys.rst
  *
  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)

include/keys/asymmetric-type.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /* Asymmetric Public-key cryptography key type interface
  *
- * See Documentation/crypto/asymmetric-keys.txt
+ * See Documentation/crypto/asymmetric-keys.rst
  *
  * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)