[PATCH v2 1/6] doc: fix underlines too long in testpmd documentation

[Michael Baum <michaelba@nvidia.com>]

In testpmd documentation, there are two underlines which should not
match the length of the text above.

This patch update them to be align with the guideline [1].

[1]
https://doc.dpdk.org/guides/contributing/documentation.html#section-headers

Fixes: a69c335d56b5 ("doc: add flow dump command in testpmd guide")
Fixes: 0e459ffa0889 ("app/testpmd: support flow aging")
Cc: jackmin@mellanox.com
Cc: dongz@mellanox.com
Cc: stable@dpdk.org

Signed-off-by: Michael Baum <michaelba@nvidia.com>
Reviewed-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Yuying Zhang <Yuying.Zhang@intel.com>
---
 doc/guides/testpmd_app_ug/testpmd_funcs.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 96c5ae0fe4..b5649d9d9a 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -4240,7 +4240,7 @@ Disabling isolated mode::
  testpmd>
 
 Dumping HW internal information
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ``flow dump`` dumps the hardware's internal representation information of
 all flows. It is bound to ``rte_flow_dev_dump()``::
@@ -4256,7 +4256,7 @@ Otherwise, it will complain error occurred::
    Caught error type [...] ([...]): [...]
 
 Listing and destroying aged flow rules
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ``flow aged`` simply lists aged flow rules be get from api ``rte_flow_get_aged_flows``,
 and ``destroy`` parameter can be used to destroy those flow rules in PMD.
-- 
2.25.1