Axe the last ent

In the name of Standardization, this cleanses the last usage string of
mystical creatures.  But they still dwell deep within the source and in
some debug messages, it is said.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-tar-tree.c

@@ -14,7 +14,7 @@
 #define BLOCKSIZE	(RECORDSIZE * 20)
 
 static const char tar_tree_usage[] =
-"git-tar-tree [--remote=<repo>] <ent> [basedir]";
+"git-tar-tree [--remote=<repo>] <tree-ish> [basedir]";
 
 static char block[BLOCKSIZE];
 static unsigned long offset;