[PATCH v6 1/7] doc: explain debug options in mbuf guide

[Thomas Monjalon <thomas@monjalon.net>]

Mention RTE_LIBRTE_MBUF_DEBUG and RTE_ENABLE_ASSERT
which enable many debug checks in the mbuf library.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
---
 doc/guides/prog_guide/mbuf_lib.rst | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/doc/guides/prog_guide/mbuf_lib.rst b/doc/guides/prog_guide/mbuf_lib.rst
index 4ad2a21f3f..badc0f3501 100644
--- a/doc/guides/prog_guide/mbuf_lib.rst
+++ b/doc/guides/prog_guide/mbuf_lib.rst
@@ -266,8 +266,13 @@ can be found in several of the sample applications, for example, the IPv4 Multic
 Debug
 -----
 
-In debug mode, the functions of the mbuf library perform sanity checks before any operation (such as, buffer corruption,
-bad type, and so on).
+When ``RTE_LIBRTE_MBUF_DEBUG`` is enabled at compilation,
+some major mbuf operations (clone, copy, freeing)
+perform sanity checks (such as buffer corruption, bad type, and so on).
+
+When ``RTE_ENABLE_ASSERT`` is enabled,
+more basic checks are done in many functions.
+
 
 Use Cases
 ---------
-- 
2.51.0