[PATCH 4/6] protocol-capabilities.txt: refer multi_ack_detailed back to pack-protocol.txt

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

pack-protocol.txt explains in detail how multi_ack_detailed works and
what's the difference between no multi_ack, multi_ack and
multi_ack_detailed. No need to repeat here.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 Documentation/technical/protocol-capabilities.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/technical/protocol-capabilities.txt b/Documentation/technical/protocol-capabilities.txt
index e3e7924..cb40ebb 100644
--- a/Documentation/technical/protocol-capabilities.txt
+++ b/Documentation/technical/protocol-capabilities.txt
@@ -69,6 +69,12 @@ ends.
 Without multi_ack the client would have sent that c-b-a chain anyway,
 interleaved with S-R-Q.
 
+multi_ack_detailed
+------------------
+This is an extension of multi_ack that permits client to better
+understand the server's in-memory state. See pack-protocol.txt,
+section "Packfile Negotiation" for more information.
+
 thin-pack
 ---------
 
-- 
1.8.5.2.240.g8478abd