mbuf: fix typo in dynamic field convention note

[ upstream commit 34d26d2 ]

Replace "in a in PMD" with "in a PMD".

Fixes: 4958ca3 ("mbuf: support dynamic fields and flags")

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>

lib/librte_mbuf/rte_mbuf_dyn.h

@@ -62,7 +62,7 @@
  * conventions than function names in dpdk:
  * - "rte_mbuf_dynfield_<name>" if defined in mbuf library
  * - "rte_<libname>_dynfield_<name>" if defined in another library
- * - "rte_net_<pmd>_dynfield_<name>" if defined in a in PMD
+ * - "rte_net_<pmd>_dynfield_<name>" if defined in a PMD
  * - any name that does not start with "rte_" in an application
  */