fast-import: fix typo in documentation

Signed-off-by: Samanta Navarro <ferivoz@riseup.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/git-fast-import.txt b/Documentation/git-fast-import.txt
index 7d9aad2..39cfa05 100644
--- a/Documentation/git-fast-import.txt
+++ b/Documentation/git-fast-import.txt
@@ -814,7 +814,7 @@
 	'original-oid' SP <object-identifier> LF
 ....
 
-where `<object-identifer>` is any string not containing LF.
+where `<object-identifier>` is any string not containing LF.
 
 `tag`
 ~~~~~