[3.12] Doc/README: Document 'make htmllive' (GH-120692) (#120991)

Co-authored-by: Hugo van Kemenade <[email protected]>
Co-authored-by: Hugo van Kemenade <[email protected]>

Author: miss-islington

Doc/README.rst

@@ -28,7 +28,7 @@ install the tools into there.
 Using make
 ----------
 
-To get started on UNIX, you can create a virtual environment and build
+To get started on Unix, you can create a virtual environment and build
 documentation with the commands::
 
   make venv
@@ -40,13 +40,13 @@ If you'd like to create the virtual environment in a different location,
 you can specify it using the ``VENVDIR`` variable.
 
 You can also skip creating the virtual environment altogether, in which case
-the Makefile will look for instances of ``sphinx-build`` and ``blurb``
+the ``Makefile`` will look for instances of ``sphinx-build`` and ``blurb``
 installed on your process ``PATH`` (configurable with the ``SPHINXBUILD`` and
 ``BLURB`` variables).
 
-On Windows, we try to emulate the Makefile as closely as possible with a
+On Windows, we try to emulate the ``Makefile`` as closely as possible with a
 ``make.bat`` file. If you need to specify the Python interpreter to use,
-set the PYTHON environment variable.
+set the ``PYTHON`` environment variable.
 
 Available make targets are:
 
@@ -62,15 +62,19 @@ Available make targets are:
 * "htmlview", which re-uses the "html" builder, but then opens the main page
   in your default web browser.
 
+* "htmllive", which re-uses the "html" builder, rebuilds the docs,
+  starts a local server, and automatically reloads the page in your browser
+  when you make changes to reST files (Unix only).
+
 * "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
+  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
+* "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.
@@ -95,8 +99,6 @@ Available make targets are:
 
 * "check", which checks for frequent markup errors.
 
-* "serve", which serves the build/html directory on port 8000.
-
 * "dist", (Unix only) which creates distributable archives of HTML, text,
   PDF, and EPUB builds.