Mention PATH niggles in more detail
Mention PATH niggles in more detail

Closes #1938.

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Reviewed-on: https://github.com/bazelbuild/bazel/pull/1938
MOS_MIGRATED_REVID=136603317

davidzchen/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website