Change a couple of existing prints.  Original patch by Serhiy Storchaka.

focussed and move advanced section and customization information to a separate
file called appendix.

Patch credits: Jamayla Wiley, Ya-Ting Huang and James Brewer.

Patch by Chris Rebert.

representation of Handle and TimerHandle after cancel().

Issue #22419: Limit the length of incoming HTTP request in wsgiref server to 65536 bytes.

Issue #22421 - Secure pydoc server run. Bind it to localhost instead of all interfaces.

with non-standard cookie handling in some Web browsers.

Reported by Sergey Bobrov.

with non-standard cookie handling in some Web browsers.

Reported by Sergey Bobrov.

directory to sys.path when running from a build directory.  That has
proven to be problematic for several standard library modules with
C extension modules whose builds can fail on some platforms.

when it is run with pythonw.exe.

Documented that Tk.report_callback_exception() is purposed to be overriden in
applications.

character instead of truncate it.  Based on patch by Victor Stinner.

empty string or tuple argument.

On some platforms Tcl memory allocator returns NULL when allocating zero-sized
block of memory.

ckalloc() causes the Tcl interpreter to panic, attemptckalloc() returns NULL
if the memory allocation fails.

Patch from Thomas Kluyver.

First letter no longer is stripped from the "status" key in
the result of Treeview.heading().

a pipe in _ipconfig_getnode().

response is received.  Patch by Martin Panter.