bug#30610: clarify linux-mode usage from Lisp

[John Shahid <jvshahid@gmail.com>]

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From 04d261f836e5b000e8f6ed9e343417feaa8bc273 Mon Sep 17 00:00:00 2001
From: John Shahid <jvshahid@gmail.com>
Date: Sun, 25 Feb 2018 14:33:00 -0500
Subject: [PATCH] clarifies linum-mode usage from Lisp

---
 lisp/linum.el | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lisp/linum.el b/lisp/linum.el
index 9df0c5d023..fa66d62bfe 100644
--- a/lisp/linum.el
+++ b/lisp/linum.el
@@ -76,8 +76,12 @@ linum-delay
 (define-minor-mode linum-mode
   "Toggle display of line numbers in the left margin (Linum mode).
 With a prefix argument ARG, enable Linum mode if ARG is positive,
-and disable it otherwise.  If called from Lisp, enable the mode
-if ARG is omitted or nil.
+and disable it otherwise.
+
+When called from Lisp, toggles the mode if the argument is
+`toggle', disables the mode if the argument is a non-positive
+integer, and enables the mode otherwise (including if the
+argument is omitted or nil or a positive integer).
 
 Linum mode is a buffer-local minor mode."
   :lighter ""                           ; for desktop.el
-- 
2.16.2


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The attached patch fixes a bug in the docstring of linum-mode regarding
calling it from Lisp. It incorrectly state that calling the function
with no args or nil will enable the mode; this gives the impression that
any other value disables the mode, which isn't the case. The patches
copies the relevant section from define-minor-mode

cheers,

-js