The file PCbuild/readme.txt still mentions the build_pgo.bat script, even though it was removed in python 3.6 (see https://github.com/python/cpython/blob/f4c03484da59049eb62a9bf7777b963e2267d187/Misc/NEWS.d/3.6.0a1.rst)

Linked PRs

• gh-91795: Update build optimization part of PCbuild/readme.txt #91849
• [3.12] gh-91795: Update build optimization part of PCbuild/readme.txt (GH-91849) #107776
• [3.11] gh-91795: Update build optimization part of PCbuild/readme.txt (GH-91849) #107777