documentation is misleading

[Glauber Costa]

Hi Zach,

One cannot put crfs to run by following the docs. Although it's a nitpick,
I'm sending a patch anyway, for future developers  ;-)
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# HG changeset patch
# User glommer at redhat.com
# Date 1222352304 10800
# Node ID a36565371e5f2a83e88be8506d1150266be63fce
# Parent  e18af4498c4071330db325dfa4f09bc3c0ed9083
doc is actually misleading

log_dir does not exist, it's working dir

diff --git a/docs/developer-instructions b/docs/developer-instructions
--- a/docs/developer-instructions
+++ b/docs/developer-instructions
@@ -41,7 +41,7 @@
 $ cat << EOF > /tmp/crfsd.conf
 btrfs_volume = /tmp/btrfs.image
 listen_ipv4 = 127.0.0.1
-log_dir = /tmp/crfsd-logs
+working_dir = /tmp/crfsd-logs
 EOF
 
 $ mkdir /tmp/crfsd-logs