The name of the hash function is "SHA-1", not "SHA1"

Use "SHA-1" instead of "SHA1" whenever we talk about the hash function.
When used as a programming symbol, we keep "SHA1".

Signed-off-by: Thomas Ackermann <th.acker@arcor.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-merge-index.txt b/Documentation/git-merge-index.txt
index 0c80cec..02676fb 100644
--- a/Documentation/git-merge-index.txt
+++ b/Documentation/git-merge-index.txt
@@ -14,7 +14,7 @@
 DESCRIPTION
 -----------
 This looks up the <file>(s) in the index and, if there are any merge
-entries, passes the SHA1 hash for those files as arguments 1, 2, 3 (empty
+entries, passes the SHA-1 hash for those files as arguments 1, 2, 3 (empty
 argument if no file), and <file> as argument 4.  File modes for the three
 files are passed as arguments 5, 6 and 7.