Update documentation for sys.winver to not say it's "normally the first three characters of version"

[brettcannon]

Documentation

https://docs.python.org/3/library/sys.html#sys.winver says:

The value is normally the first three characters of version.

That has not been true since Python 3.11. It should probably be updated to say something like, "The value is normally the major and minor versions of the running Python interpreter," or something along those lines.

Linked PRs

• GH-100894: Updated the doc for sys.winver #100913
• [3.11] GH-100894: Updated the doc for sys.winver to clarify its usual contents (GH-100913) #100962
• [3.10] GH-100894: Updated the doc for sys.winver to clarify its usual contents (GH-100913) #100963

[eryksun]

The build architecture is also included as a suffix, except for x64.

cpython/PCbuild/python.props

Lines 229 to 231 in 61762b9

	<!-- The version number for sys.winver -->
	<SysWinVer>$(MajorVersionNumber).$(MinorVersionNumber)$(PyArchExt)$(PyTestExt)</SysWinVer>
	</PropertyGroup>

cpython/PCbuild/python.props

Lines 79 to 85 in 61762b9

	<!-- Suffix for versions/keys when building with test markers -->
	<PyTestExt Condition="$(UseTestMarker) == 'true'">-test</PyTestExt>
	<!-- Suffix for versions/keys when building for particular platforms -->
	<PyArchExt Condition="'$(ArchName)' == 'win32'">-32</PyArchExt>
	<PyArchExt Condition="'$(ArchName)' == 'arm32'">-arm32</PyArchExt>
	<PyArchExt Condition="'$(ArchName)' == 'arm64'">-arm64</PyArchExt>

For example:

• "3.11-32"
• "3.11-arm32"
• "3.11-arm64"

There can also be a "-test" suffix (e.g. build.bat --test-marker), but it's not a "normal" value. For example:

• "3.11-test"
• "3.11-32-test"
• "3.11-arm32-test"
• "3.11-arm64-test"

[zooba]

That has not been true since Python 3.11

Since 3.10 actually :)

I'm okay with only documenting it as "usually". It is actually the most useful way to find out if you're running an ARM64 version of Python, but there's no need to document it as such.