Update build-javascript.md
Update build-javascript.md

Make npm link clickable in generated docs.

Closes #12769.

PiperOrigin-RevId: 383407503

katre/bazel,perezd/bazel,ButterflyNetwork/bazel,cushon/bazel,katre/bazel,bazelbuild/bazel,katre/bazel,perezd/bazel,cushon/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel,perezd/bazel,ButterflyNetwork/bazel,cushon/bazel,ButterflyNetwork/bazel,perezd/bazel,ButterflyNetwork/bazel,perezd/bazel,katre/bazel,perezd/bazel,bazelbuild/bazel,katre/bazel,bazelbuild/bazel,bazelbuild/bazel,katre/bazel,bazelbuild/bazel,cushon/bazel,cushon/bazel,bazelbuild/bazel,cushon/bazel,perezd/bazel