[PATCH 5/5] commit-graph-format.txt: fix "Hash Version" description

["Martin Ågren" <martin.agren@gmail.com>]

We say that value 1 means "SHA-1", but in fact, it means "whatever
the_hash_algo is", see commit c166599862 ("commit-graph: convert to
using the_hash_algo", 2018-11-14).

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 If we want to be more fine-grained in the future, we'll need to say,
 e.g., "2 means SHA-1, 3 means SHA-256" or, perhaps preferrably, bump the
 version number.

 I wonder: Should we instead say "1 means SHA-1, 2 means SHA-256"? It
 could be implemented as "easily" as "if (value_from_header !=
 value_from_the_hash_algo) die(...);" for now. Might that pay off in the
 long run?

 This relates to Stolee's "in a vacuum" comment [1] ... so maybe we're
 fine.

 [1] https://lore.kernel.org/git/da077fb0-14bb-b84f-c526-d759ebc9f5eb@gmail.com/

 Documentation/technical/commit-graph-format.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/technical/commit-graph-format.txt b/Documentation/technical/commit-graph-format.txt
index 440541045d..3535426d32 100644
--- a/Documentation/technical/commit-graph-format.txt
+++ b/Documentation/technical/commit-graph-format.txt
@@ -42,8 +42,8 @@ HEADER:
   1-byte version number:
       Currently, the only valid version is 1.
 
-  1-byte Hash Version (1 = SHA-1)
-      We infer the hash length (H) from this value.
+  1-byte Hash Version (1 = SHA-1 in SHA-1 repo, SHA-256 in SHA-256 repo)
+      We infer the hash length (H) from the hash algo derived from this value.
 
   1-byte number (C) of "chunks"
 
-- 
2.28.0.277.g9b3c35fffd