default build profile is no longer none

[prince-chrismc]

Changelog: Fix: Fix description for the conf entry for default build profile used.
Docs: conan-io/docs#3252

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Saw this while poking around 😄 seems like it was missed in the migration

conan/conans/client/profile_loader.py

Line 103 in 648dda2

default_profile = cache.new_config.get("core:default_build_profile", default=DEFAULT_PROFILE_NAME)

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[AbrilRBS]

Hello stranger 🙈 Good catch!
Thanks a lot for your contribution, I have submitted conan-io/docs#3252 to the docs to keep them in sync :)