PEP 11: Demote macOS x86_64 to tier 2 (#4548)

Demote macOS x86_64 to tier 2

I volunteered the people who spoke up in
https://discuss.python.org/t/dropping-intel-mac-to-tier-2/102100 as the owners.
A few more of us also have final-model 8th-gen Intel mac hardware available but
the list is already longer than we require.  It'll stop getting security
updates from Apple and thus be dangerous to even have online before we lose
sufficient access for even tier 2.

Also clarify that my tier 3 Raspberry Pi is intentionally running the
all-models compatible 32-bit OS.

Co-authored-by: Brett Cannon <brett@python.org>

Author: gpshead

peps/pep-0011.rst

@@ -83,7 +83,6 @@ aarch64-apple-darwin      clang
 aarch64-unknown-linux-gnu glibc, gcc
 i686-pc-windows-msvc
 x86_64-pc-windows-msvc
-x86_64-apple-darwin       BSD libc, clang
 x86_64-unknown-linux-gnu  glibc, gcc
 ========================= =====
 
@@ -103,6 +102,7 @@ Target Triple                 Notes                      Contacts
 ============================= ========================== ========
 aarch64-unknown-linux-gnu     glibc, clang               Victor Stinner, Gregory P. Smith
 wasm32-unknown-wasip1         WASI SDK, Wasmtime         Brett Cannon, Michael Droettboom
+x86_64-apple-darwin           macOS, clang               Sam Gross, Barry Warsaw, Ronald Oussoren
 x86_64-unknown-linux-gnu      glibc, clang               Victor Stinner, Gregory P. Smith
 ============================= ========================== ========
 
@@ -123,7 +123,7 @@ aarch64-linux-android                                        Russell Keith-Magee
 aarch64-pc-windows-msvc                                      Steve Dower
 arm64-apple-ios                  iOS on device               Russell Keith-Magee, Ned Deily
 arm64-apple-ios-simulator        iOS on M1 macOS simulator   Russell Keith-Magee, Ned Deily
-armv7l-unknown-linux-gnueabihf   Raspberry Pi OS, glibc, gcc Gregory P. Smith
+armv7l-unknown-linux-gnueabihf   32-bit Raspberry Pi OS, gcc Gregory P. Smith
 powerpc64le-unknown-linux-gnu    glibc, clang                Victor Stinner
 
                                  glibc, gcc                  Victor Stinner