[dpdk-stable] [scripts] README: add hint on commit range to generate backport list

[Xueming Li]

Adds tip of the commit range to generate backport list.

Signed-off-by: Xueming Li <xuemingl at nvidia.com>
---
 README | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/README b/README
index 6489379..e9795b5 100644
--- a/README
+++ b/README
@@ -26,8 +26,10 @@ as tmp dir for the patches and mails.
 1.A
 ---
 A list of commits to backport should be generated. This can be generated
-from "git-log-fixes.sh" script from DPDK. Assuming v17.11-rc1 is out
-you can prepare a commit list for v17.08.1 stable release with:
+from "git-log-fixes.sh" script from DPDK. Normally the start of range is
+the end tag of last generated range, branch tag if working on the first
+stable release. The end of range is latest release tag. Assuming v17.11-rc1
+is out you can prepare a commit list for v17.08.1 stable release with:
 
     $ ./devtools/git-log-fixes.sh v17.08..v17.11-rc1 > /tmp/list
 
-- 
2.25.1