[PATCHv3] Documentation: kgdb: Replace deprecated remotebaud

["Christian Löhle" <CLoehle@hyperstone.com>]

Using set remotebaud to set the baud rate was deprecated in
gdb-7.7 and completely removed from the command parser in gdb-7.8
(released in 2014). Adopt set serial baud instead.

Change since v2:
  - Add historical example in the documentation

Signed-off-by: Christian Loehle <cloehle@hyperstone.com>
---
 Documentation/dev-tools/kgdb.rst | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/dev-tools/kgdb.rst b/Documentation/dev-tools/kgdb.rst
index 43456244651a..d7acb2bdb0ba 100644
--- a/Documentation/dev-tools/kgdb.rst
+++ b/Documentation/dev-tools/kgdb.rst
@@ -557,9 +557,14 @@ Connecting with gdb to a serial port
    Example (using a directly connected port)::
 
            % gdb ./vmlinux
-           (gdb) set remotebaud 115200
+           (gdb) set serial baud 115200
            (gdb) target remote /dev/ttyS0
 
+   Example (using a directly connected port with gdb version < 7.8)::
+
+           % gdb ./vmlinux
+           (gdb) set remotebaud 115200
+           (gdb) target remote /dev/ttyS0
 
    Example (kgdb to a terminal server on TCP port 2012)::
 
-- 
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