README: expand board/project-specific usage to [2000,4999]

Some partners (COS) are interested in having a few more users for
their own use.  Give them a little more head room.

BUG=None
TEST=None

Change-Id: I99dc5e23540d7e7f9e2cfd9207568b2b38129bd5
Reviewed-on: https://chromium-review.googlesource.com/1194706
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
diff --git a/profiles/base/accounts/README.md b/profiles/base/accounts/README.md
index 93d8b65..a592cd5 100644
--- a/profiles/base/accounts/README.md
+++ b/profiles/base/accounts/README.md
@@ -72,7 +72,7 @@
 
 ## Board/project-specific accounts
 
-For boards creating their own users, the 2000-2999 range is reserved for that.
+For boards creating their own users, the 2000-4999 range is reserved for that.
 Boards must take care that they don't create conflicts amongst themselves or
 any project overlays they inherit.