Doc readme: Fix markup, use https:// URLs.

Doc/README.txt

@@ -7,7 +7,7 @@ available at <https://docs.python.org/dev/download.html>.
 
 Documentation on authoring Python documentation, including information about
 both style and markup, is available in the "Documenting Python" chapter of the
-developers guide <http://docs.python.org/devguide/documenting.html>.
+developers guide <https://docs.python.org/devguide/documenting.html>.
 
 
 Building the docs
@@ -15,7 +15,7 @@ Building the docs
 
 You need to have Sphinx <http://sphinx-doc.org/> installed; it is the toolset
 used to build the docs.  It is not included in this tree, but maintained
-separately and available from PyPI <http://pypi.python.org/pypi/Sphinx>.
+separately and available from PyPI <https://pypi.python.org/pypi/Sphinx>.
 
 
 Using make
@@ -43,53 +43,53 @@ the SPHINXBUILD variable.
 
 Available make targets are:
 
- * "clean", which removes all build files.
+* "clean", which removes all build files.
 
- * "html", which builds standalone HTML files for offline viewing.
+* "html", which builds standalone HTML files for offline viewing.
 
- * "htmlview", which re-uses the "html" builder, but then opens the main page
-   in your default web browser.
+* "htmlview", which re-uses the "html" builder, but then opens the main page
+  in your default web browser.
 
- * "htmlhelp", which builds HTML files and a HTML Help project file usable to
-   convert them into a single Compiled HTML (.chm) file -- these are popular
-   under Microsoft Windows, but very handy on every platform.
+* "htmlhelp", which builds HTML files and a HTML Help project file usable to
+  convert them into a single Compiled HTML (.chm) file -- these are popular
+  under Microsoft Windows, but very handy on every platform.
 
-   To create the CHM file, you need to run the Microsoft HTML Help Workshop
-   over the generated project (.hhp) file.  The make.bat script does this for
-   you on Windows.
+  To create the CHM file, you need to run the Microsoft HTML Help Workshop
+  over the generated project (.hhp) file.  The make.bat script does this for
+  you on Windows.
 
- * "latex", which builds LaTeX source files as input to "pdflatex" to produce
-   PDF documents.
+* "latex", which builds LaTeX source files as input to "pdflatex" to produce
+  PDF documents.
 
- * "text", which builds a plain text file for each source file.
+* "text", which builds a plain text file for each source file.
 
- * "epub", which builds an EPUB document, suitable to be viewed on e-book
-   readers.
+* "epub", which builds an EPUB document, suitable to be viewed on e-book
+  readers.
 
- * "linkcheck", which checks all external references to see whether they are
-   broken, redirected or malformed, and outputs this information to stdout as
-   well as a plain-text (.txt) file.
+* "linkcheck", which checks all external references to see whether they are
+  broken, redirected or malformed, and outputs this information to stdout as
+  well as a plain-text (.txt) file.
 
- * "changes", which builds an overview over all versionadded/versionchanged/
-   deprecated items in the current version. This is meant as a help for the
-   writer of the "What's New" document.
+* "changes", which builds an overview over all versionadded/versionchanged/
+  deprecated items in the current version. This is meant as a help for the
+  writer of the "What's New" document.
 
- * "coverage", which builds a coverage overview for standard library modules and
-   C API.
+* "coverage", which builds a coverage overview for standard library modules and
+  C API.
 
- * "pydoc-topics", which builds a Python module containing a dictionary with
-   plain text documentation for the labels defined in
-   `tools/pyspecific.py` -- pydoc needs these to show topic and keyword help.
+* "pydoc-topics", which builds a Python module containing a dictionary with
+  plain text documentation for the labels defined in
+  `tools/pyspecific.py` -- pydoc needs these to show topic and keyword help.
 
- * "suspicious", which checks the parsed markup for text that looks like
-   malformed and thus unconverted reST.
+* "suspicious", which checks the parsed markup for text that looks like
+  malformed and thus unconverted reST.
 
- * "check", which checks for frequent markup errors.
+* "check", which checks for frequent markup errors.
 
- * "serve", which serves the build/html directory on port 8000.
+* "serve", which serves the build/html directory on port 8000.
 
- * "dist", (Unix only) which creates distributable archives of HTML, text,
-   PDF, and EPUB builds.
+* "dist", (Unix only) which creates distributable archives of HTML, text,
+  PDF, and EPUB builds.
 
 
 Without make
@@ -109,10 +109,10 @@ Contributing
 ============
 
 Bugs in the content should be reported to the Python bug tracker at
-http://bugs.python.org.
+https://bugs.python.org.
 
 Bugs in the toolset should be reported in the Sphinx bug tracker at
-http://www.bitbucket.org/birkenfeld/sphinx/issues/.
+https://www.bitbucket.org/birkenfeld/sphinx/issues/.
 
 You can also send a mail to the Python Documentation Team at docs@python.org,
 and we will process your request as soon as possible.