Update platforms.md documentation
Update platforms.md documentation

Closes #8513.

PiperOrigin-RevId: 255944103

bazelbuild/bazel,davidzchen/bazel,dslomov/bazel-windows,akira-baruah/bazel,cushon/bazel,aehlig/bazel,ulfjack/bazel,twitter-forks/bazel,meteorcloudy/bazel,werkt/bazel,cushon/bazel,meteorcloudy/bazel,perezd/bazel,perezd/bazel,meteorcloudy/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,twitter-forks/bazel,aehlig/bazel,aehlig/bazel,werkt/bazel,dslomov/bazel,dslomov/bazel,dslomov/bazel,aehlig/bazel,ButterflyNetwork/bazel,safarmer/bazel,cushon/bazel,katre/bazel,akira-baruah/bazel,akira-baruah/bazel,katre/bazel,dslomov/bazel-windows,davidzchen/bazel,dslomov/bazel-windows,davidzchen/bazel,katre/bazel,twitter-forks/bazel,davidzchen/bazel,safarmer/bazel,ulfjack/bazel,cushon/bazel,aehlig/bazel,bazelbuild/bazel,aehlig/bazel,dslomov/bazel,werkt/bazel,safarmer/bazel,twitter-forks/bazel,perezd/bazel,twitter-forks/bazel,werkt/bazel,werkt/bazel,akira-baruah/bazel,dslomov/bazel,bazelbuild/bazel,safarmer/bazel,meteorcloudy/bazel,werkt/bazel,bazelbuild/bazel,safarmer/bazel,davidzchen/bazel,akira-baruah/bazel,twitter-forks/bazel,dslomov/bazel-windows,meteorcloudy/bazel,perezd/bazel,perezd/bazel,dslomov/bazel,ButterflyNetwork/bazel,ulfjack/bazel,ulfjack/bazel,katre/bazel,ulfjack/bazel,twitter-forks/bazel,perezd/bazel,meteorcloudy/bazel,cushon/bazel,cushon/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,dslomov/bazel-windows,ulfjack/bazel,ulfjack/bazel,davidzchen/bazel,safarmer/bazel,katre/bazel,bazelbuild/bazel,aehlig/bazel,akira-baruah/bazel,perezd/bazel,davidzchen/bazel,dslomov/bazel,katre/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel