[PATCH] xargs.1: clarify 'echo' as the default command

The default command changed from '/bin/echo' to 'echo' in version 4.5.11,
but the commit 804ff7b90e only adjusted the Texinfo manual.

* xargs/xargs.1 (.SH DESCRIPTION): Change the default command here
in the man page as well.
---
 xargs/xargs.1 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xargs/xargs.1 b/xargs/xargs.1
index 66dcfde0..60ef0bef 100644
--- a/xargs/xargs.1
+++ b/xargs/xargs.1
@@ -18,7 +18,7 @@ protected with double or single quotes or a backslash) or newlines,
 and executes the
 .I command
 (default is
-.IR /bin/echo )
+.IR echo )
 one or more times with any
 .I initial-arguments
 followed by items read from standard input.  Blank lines on the
-- 
2.30.0