Fix --batch link in blaze user manual to match other flags.
Fix --batch link in blaze user manual to match other flags.

RELNOTES: nope

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MOS_MIGRATED_REVID=99931043

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