Trac #30636: failing doctest with optional tag octave

{{{
sage -t --optional=sage,octave
src/doc/en/constructions/interface_issues.rst
}}}
gives
{{{
sage -t --random-seed=0 src/doc/en/constructions/interface_issues.rst
**********************************************************************
File "src/doc/en/constructions/interface_issues.rst", line 432, in
doc.en.constructions.interface_issues
Failed example:
    octave("atanh(1.1)")   ## optional - octave
Expected:
    (1.52226,-1.5708)
Got:
     (1.52226,1.5708)
**********************************************************************
}}}

This is using:
{{{
$ octave --version
octave: X11 DISPLAY environment variable not set
octave: disabling GUI features
GNU Octave, version 4.2.2
Copyright (C) 2018 John W. Eaton and others.
This is free software; see the source code for copying conditions.
There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.

Octave was configured for "x86_64-pc-linux-gnu".

Additional information about Octave is available at
http://www.octave.org.

Please contribute if you find this software useful.
For more information, visit http://www.octave.org/get-involved.html

Read http://www.octave.org/bugs.html to learn how to submit bug reports.
}}}
indeed:
{{{
octave:1> atanh(1.1)
ans =  1.5223 + 1.5708i
}}}

URL: https://trac.sagemath.org/30636
Reported by: slabbe
Ticket author(s): Frédéric Chapoton
Reviewer(s): Sébastien Labbé

src/doc/en/constructions/interface_issues.rst

@@ -425,12 +425,12 @@ in Sage).
 
 Here's an example using Sage's interface (located in
 sage/interfaces/octave.py) with ``octave``
-(http://www.octave.org/doc/index.html).
+(https://www.gnu.org/software/octave/doc/latest).
 
 ::
 
     sage: octave("atanh(1.1)")   ## optional - octave
-    (1.52226,-1.5708)
+    (1.52226,1.5708)
 
 Here's an example using Sage's interface to ``pari``'s special
 functions.