[PATCH 6/7] doc: update argument options for external DPDK build

["Tomáš Ďurovec" <tomas.durovec@pantheon.tech>]

By adding support for external build, we extend the
argument documentation for supported options.

Signed-off-by: Tomáš Ďurovec <tomas.durovec@pantheon.tech>
---
 doc/guides/tools/dts.rst | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/guides/tools/dts.rst b/doc/guides/tools/dts.rst
index 65cce9e5ed..20d4d18b18 100644
--- a/doc/guides/tools/dts.rst
+++ b/doc/guides/tools/dts.rst
@@ -236,12 +236,14 @@ DTS is run with ``main.py`` located in the ``dts`` directory after entering Poet
      -t SECONDS, --timeout SECONDS
                            [DTS_TIMEOUT] The default timeout for all DTS operations except for compiling DPDK. (default: 15)
      -v, --verbose         [DTS_VERBOSE] Specify to enable verbose output, logging all messages to the console. (default: False)
-     -s, --skip-setup      [DTS_SKIP_SETUP] Specify to skip all setup steps on SUT and TG nodes. (default: False)
+     --dpdk-tree DIR_PATH  [DTS_DPDK_TREE] Path to DPDK source code tree to test. (default: None)
      --tarball FILE_PATH, --snapshot FILE_PATH
                            [DTS_DPDK_TARBALL] Path to DPDK source code tarball to test. (default: None)
      --revision ID, --rev ID, --git-ref ID
                            [DTS_DPDK_REVISION_ID] Git revision ID to test. Could be commit, tag, tree ID etc. To test local changes, first
                            commit them, then use their commit ID. (default: None)
+     --remote-source       [DTS_REMOTE_SOURCE] Set when the DPDK source tree or tarball is located on the SUT node. (default: False)
+     --build-dir DIR_NAME  [DTS_BUILD_DIR] A directory name, which would be located in the `dpdk tree` or `tarball`. (default: None)
      --compile-timeout SECONDS
                            [DTS_COMPILE_TIMEOUT] The timeout for compiling DPDK. (default: 1200)
      --test-suite TEST_SUITE [TEST_CASES ...]
@@ -257,8 +259,9 @@ DTS is run with ``main.py`` located in the ``dts`` directory after entering Poet
 
 
 The brackets contain the names of environment variables that set the same thing.
-The minimum DTS needs is a config file and a DPDK tarball or git ref ID.
-You may pass those to DTS using the command line arguments or use the default paths.
+The minimum DTS needs is a config file and a pre-built DPDK or DPDK
+sources location which can be specified in said config file or on the
+command line or environment variables.
 
 Example command for running DTS with the template configuration and DPDK tag v23.11:
 
-- 
2.46.1