fix nit in recent doc change

[Jim Meyering]

FYI, (thanks to the nixos/hydra autobuilder for the quick alert)

>From 0a8d30534b4285eec464a684694c0f0dc3810f1e Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Mon, 23 May 2011 20:03:58 +0200
Subject: [PATCH] maint: avoid trivial syntax-check failure

* doc/coreutils.texi (tail invocation): Use @var{n}, not @var{N}.
---
 doc/coreutils.texi |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index dfaf4c9..fa7e015 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -2832,7 +2832,7 @@ tail invocation

 With kernel inotify support, output is asynchronous and generally very prompt.
 Otherwise, @command{tail} sleeps for one second between checks---
-use @option{--sleep-interval=@var{N}} to change that default---which can
+use @option{--sleep-interval=@var{n}} to change that default---which can
 make the output appear slightly less responsive or bursty.

 @item -F
--
1.7.5.2.1.g56b30