samples: net: zperf: Fix the readme file

As there is no shell submodules any more, the "zperf" command
needs to be written in every command.

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

samples/net/zperf/README.rst

@@ -57,43 +57,43 @@ In the Zephyr console, zperf can be executed as follows:
 
 .. code-block:: console
 
-   zperf> udp upload 2001:db8::2 5001 10 1K 1M
+   zperf udp upload 2001:db8::2 5001 10 1K 1M
 
 
 For TCP the zperf command would look like this:
 
 .. code-block:: console
 
-   zperf> tcp upload 2001:db8::2 5001 10 1K 1M
+   zperf tcp upload 2001:db8::2 5001 10 1K 1M
 
 
 If the IP addresses of Zephyr and the host machine are specified in the
 config file, zperf can be started as follows:
 
 .. code-block:: console
 
-   zperf> udp upload2 v6 10 1K 1M
+   zperf udp upload2 v6 10 1K 1M
 
 
 or like this if you want to test TCP:
 
 .. code-block:: console
 
-   zperf> tcp upload2 v6 10 1K 1M
+   zperf tcp upload2 v6 10 1K 1M
 
 
 If Zephyr is acting as a server, set the download mode as follows for UDP:
 
 .. code-block:: console
 
-   zperf> udp download 5001
+   zperf udp download 5001
 
 
 or like this for TCP:
 
 .. code-block:: console
 
-   zperf> tcp download 5001
+   zperf tcp download 5001
 
 
 and in the host side, iPerf must be executed with the following