notebook: help screen talks about DIR variable, which was removed from the notebook a while ago

[williamstein]

So... delete the section about the DIR variable, or make sure it is defined as explained in the help screen. What do people prefer?

CC: @sagetrac-acleone @qed777

Component: notebook

Author: Tim Dumol

Reviewer: Alex Leone

Merged: sagenb-0.7

Issue created by migration from https://trac.sagemath.org/ticket/7435

[TimDumol]

Adds the DIR variable

[TimDumol]

comment:1

Attachment: trac_7435-dir-var.patch.gz

This patch adds the DIR variable.

[TimDumol]

Author: Tim Dumol

[sagetrac-acleone]

comment:2

LGTM.

[sagetrac-acleone]

Reviewer: Alex Leone

[qed777]

Attachment: trac_7435-dir-var.2.patch.gz

Rebased for SageNB 0.6 + queue in comment. Replaces previous.

[qed777]

Merged: sagenb-0.7