docs: fix markup for list of "Important Notes"

This had me confused while reading, because the list wasn't rendered as
list (but as a paragraph) and I wondered why starting with 00 would
increase the chance of overflow...

Signed-off-by: Jonas Schäfer <jonas@zombofant.net>

diff --git a/docs/dnssec/operational.rst b/docs/dnssec/operational.rst
index 5ce7abfb2112b52aa9228f1b3460c1accc985f2f..3a5a952a66704a0c5e50c734537c2657ccaabd73 100644 (file)
--- a/docs/dnssec/operational.rst
+++ b/docs/dnssec/operational.rst
@@ -240,6 +240,7 @@ Uses the YYYYMMDDSS format for SOA serial numbers. The "inception day" is determ
 - Otherwise, the serial remains unchanged.
 
 **Important Notes**:
+
 - Avoid using SS=00 in backend zones, as it may prevent proper zone transfers (AXFR/IXFR) to secondaries.
 - Serial overflow can occur if more than 99 updates are made in a single day.
 - This logic is not safe for zones with non-PowerDNS secondaries, as updates may not be detected reliably.