Fixes scripts/serve-docs.sh
Fixes scripts/serve-docs.sh

The serve-docs.sh script uses pygments for formatting code fragments which fails with "no lexer for alias 'shell' found"

PiperOrigin-RevId: 176503221

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