DOC: Fixes for 18 broken links (#16472)

* DOC: Fixes for 18 broken links

This, with PR #16465, should fix nearly all the remaining broken links
on the site. 4 or 5 others should be easy to fix and just
need attention from someone more knowledgeable -- will
open an issue. For release notes with dead links,
I could usually find links on archive.org for roughly contemporary
versions.

* DOC: Update to "Fixes for 18 broken links #16472"

* Obsolete links, previously commented out, now deleted:
https://github.com/numpy/numpy/pull/16472#discussion_r433928958

* Semantic markup for reference to Python class:
https://github.com/numpy/numpy/pull/16472#discussion_r433553928

* Missing :ref: in internal link:
https://github.com/numpy/numpy/pull/16472#discussion_r433554484

Not included: Resolution on using external/internal doc link in .py:
https://github.com/numpy/numpy/pull/16472#discussion_r433554824

* DOC: Add internal link for 'Fixes for 18 broken links' PR #16472

Making reference [1] an internal link in function_base.py => numpy.vectorize.html

* DOC: Redirect 2 link fixes in PR #16472

* governance.rst link reverted
* ununcs.rst `overridden` link goes where it was meant to


per https://github.com/numpy/numpy/pull/16472#pullrequestreview-424666070

4 files changed, 7 insertions, 8 deletions

diff --git a/doc/source/dev/gitwash/git_links.inc b/doc/source/dev/gitwash/git_links.inc
index 82e6c75e5..8032dca41 100644
--- a/doc/source/dev/gitwash/git_links.inc
+++ b/doc/source/dev/gitwash/git_links.inc
@@ -16,7 +16,7 @@
 .. _subversion: http://subversion.tigris.org/
 .. _git cheat sheet: http://cheat.errtheblog.com/s/git
 .. _pro git book: https://git-scm.com/book/
-.. _git svn crash course: https://git-scm.com/course/svn.html
+.. _git svn crash course: https://git.wiki.kernel.org/index.php/GitSvnCrashCourse
 .. _learn.github: https://learn.github.com/
 .. _network graph visualizer: https://github.blog/2008-04-10-say-hello-to-the-network-graph-visualizer/
 .. _git user manual: https://www.kernel.org/pub/software/scm/git/docs/user-manual.html
@@ -42,7 +42,7 @@
 .. _why the -a flag?: http://www.gitready.com/beginner/2009/01/18/the-staging-area.html
 .. _git staging area: http://www.gitready.com/beginner/2009/01/18/the-staging-area.html
 .. _tangled working copy problem: https://tomayko.com/writings/the-thing-about-git
-.. _git management: http://kerneltrap.org/Linux/Git_Management
+.. _git management: https://web.archive.org/web/20090328043540/http://kerneltrap.org/Linux/Git_Management
 .. _linux git workflow: https://www.mail-archive.com/dri-devel@lists.sourceforge.net/msg39091.html
 .. _ipython git workflow: https://mail.python.org/pipermail/ipython-dev/2010-October/005632.html
 .. _git parable: http://tom.preston-werner.com/2009/05/19/the-git-parable.html
diff --git a/doc/source/dev/governance/governance.rst b/doc/source/dev/governance/governance.rst
index d8719700f..9209f26b7 100644
--- a/doc/source/dev/governance/governance.rst
+++ b/doc/source/dev/governance/governance.rst
@@ -387,8 +387,7 @@ Acknowledgements
 ================
 
 Substantial portions of this document were adapted from the
-`Jupyter/IPython project's governance document
-<https://github.com/jupyter/governance/blob/master/governance.md>`_.
+`Jupyter/IPython project's governance document <https://github.com/jupyter/governance>`_
 
 License
 =======
diff --git a/doc/source/dev/howto-docs.rst b/doc/source/dev/howto-docs.rst
index 0e2e03e0b..281f87cfb 100644
--- a/doc/source/dev/howto-docs.rst
+++ b/doc/source/dev/howto-docs.rst
@@ -87,7 +87,7 @@ check out the following specific guides:
 Major additions to the documentation (e.g. new tutorials) should be proposed to
 the `mailing list
 <https://mail.python.org/mailman/listinfo/numpy-discussion>`__.
-  
+
 Other ways to contribute
 ------------------------
 
@@ -145,5 +145,5 @@ the quality of the documentation.
   resources for technical writing.
 - Google offers two free `Technical Writing Courses
   <https://developers.google.com/tech-writing>`__
-- `Software Carpentry <https://software-carpentry.org/software>`__ has a lot of
+- `Software Carpentry <https://carpentries.github.io/curriculum-development/>`__ has a lot of
   nice recommendations for creating educational material.
diff --git a/doc/source/dev/index.rst b/doc/source/dev/index.rst
index 5270bfb77..fd735f453 100644
--- a/doc/source/dev/index.rst
+++ b/doc/source/dev/index.rst
@@ -256,7 +256,7 @@ From the ``doc/`` directory:
     git submodule update --init
 
 The documentation includes mathematical formulae with LaTeX formatting.
-A working LaTeX document production system 
+A working LaTeX document production system
 (e.g. `texlive <https://www.tug.org/texlive/>`__) is required for the
 proper rendering of the LaTeX math in the documentation.
 
@@ -291,4 +291,4 @@ The rest of the story
 NumPy-specific workflow is in :ref:`numpy-development-workflow
 <development-workflow>`.
 
-.. _`mailing list`: https://mail.python.org/mailman/listinfo/numpy-devel
+.. _`mailing list`: https://mail.python.org/mailman/listinfo/numpy-discussion