docs: update stale Sphinx link in contributing guide

docs/Makefile

@@ -9,7 +9,7 @@ BUILDDIR      = _build
 
 # User-friendly check for sphinx-build
 ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
-$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from https://www.sphinx-doc.org/)
 endif
 
 # Internal variables.

docs/community/faq.rst

@@ -30,7 +30,7 @@ Why not Httplib2?
 -----------------
 
 Chris Adams gave an excellent summary on
-`Hacker News <http://news.ycombinator.com/item?id=2884406>`_:
+`Hacker News <https://news.ycombinator.com/item?id=2884406>`_:
 
     httplib2 is part of why you should use requests: it's far more respectable
     as a client but not as well documented and it still takes way too much code
@@ -44,7 +44,7 @@ Chris Adams gave an excellent summary on
     Disclosure: I'm listed in the requests AUTHORS file but can claim credit
     for, oh, about 0.0001% of the awesomeness.
 
-    1. http://code.google.com/p/httplib2/issues/detail?id=96 is a good example:
+    1. https://code.google.com/p/httplib2/issues/detail?id=96 is a good example:
     an annoying bug that affected many people, there was a fix available for
     months, which worked great when I applied it in a fork and pounded a couple
     TB of data through it, but it took over a year to make it into trunk and

docs/community/out-there.rst

@@ -7,4 +7,4 @@ Articles & Talks
 - `Issac Kelly's 'Consuming Web APIs' talk <https://issackelly.github.io/Consuming-Web-APIs-with-Python-Talk/slides/slides.html>`_
 - `Blog post about Requests via Yum <https://arunsag.wordpress.com/2011/08/17/new-package-python-requests-http-for-humans/>`_
 - `Russian blog post introducing Requests <https://habr.com/post/126262/>`_
-- `Sending JSON in Requests <http://www.coglib.com/~icordasc/blog/2014/11/sending-json-in-requests.html>`_
+- `Sending JSON in Requests <https://www.coglib.com/~icordasc/blog/2014/11/sending-json-in-requests.html>`_

docs/dev/contributing.rst

@@ -14,7 +14,7 @@ getting a feel for how contributing to this project works. If you have any
 questions, feel free to reach out to either `Nate Prewitt`_, `Ian Cordasco`_,
 or `Seth Michael Larson`_, the primary maintainers.
 
-.. _Ian Cordasco: http://www.coglib.com/~icordasc/
+.. _Ian Cordasco: https://www.coglib.com/~icordasc/
 .. _Nate Prewitt: https://www.nateprewitt.com/
 .. _Seth Michael Larson: https://sethmlarson.dev/
 
@@ -132,8 +132,8 @@ files and a semi-formal, yet friendly and approachable, prose style.
 When presenting Python code, use single-quoted strings (``'hello'`` instead of
 ``"hello"``).
 
-.. _reStructuredText: http://docutils.sourceforge.net/rst.html
-.. _Sphinx: http://sphinx-doc.org/index.html
+.. _reStructuredText: https://docutils.sourceforge.net/rst.html
+.. _Sphinx: https://www.sphinx-doc.org/en/master/
 
 
 .. _bug-reports:

docs/make.bat

@@ -65,7 +65,7 @@ if errorlevel 9009 (
 	echo.may add the Sphinx directory to PATH.
 	echo.
 	echo.If you don't have Sphinx installed, grab it from
-	echo.http://sphinx-doc.org/
+	echo.https://www.sphinx-doc.org/
 	exit /b 1
 )