doc: update octeon endpoint commands

Updating commands to install octeon endpoint binary for release and
devel repository.

Signed-off-by: Harman Kalra <hkalra@marvell.com>
Change-Id: If8b83819bc2e0972793bd983c18957aedfdac38d
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/dataplane/dpu-offload/+/136834
Tested-by: sa_ip-toolkits-Jenkins <sa_ip-toolkits-jenkins@marvell.com>

Author: harman-kalra

doc/guides/howtoguides/octep_agent.rst

@@ -36,6 +36,10 @@ Installing the octep CP agent package
 
 .. code-block:: console
 
+ Release repository
+ # apt-get install oct-ep-target-cn10k
+
+ Devel repository
  # apt-get install oct-ep-target-cn10k-devel
 
 .. _octep_cp_agent: