gh-159278: Fix Incorrect Links From Duplicate customization Label In Docs

[adqm]

Full description of the issue is in #159278. My proposed fix is removing the duplicate customization label from Doc/using/windows.rst since the new label doesn't seem to be intentionally referenced from anywhere else in the docs (these are both intended as references to the old customization label):

~/cpython/Doc$ grep -r --exclude-dir build '`customization`'
reference/expressions.rst::ref:`customization`.
builtins/stdtypes.rst:   Reference Manual (:ref:`customization`).

CCing @ZeroIntensity since we discussed this briefly in a separate PR, and also @zooba in case I'm missing a problem with removing this label.

• Issue: Duplicate reference label customization causing incorrect links in 3.16 docs #159278

[read-the-docs-community]

Documentation build overview

📚 cpython-previews | 🛠️ Build #35104931 | 📁 Comparing 2bc5017 against main (767e918)

  🔍 Preview build  

2 files changed

± builtins/stdtypes.html
± reference/expressions.html

[ZeroIntensity]

You also need to update Doc/tools/removed-ids.txt.

[adqm]

You also need to update Doc/tools/removed-ids.txt.

Oops, sorry about that; just added it!