Fixed typos on using error prone with Bazel.
Fixed typos on using error prone with Bazel.

Looks like the option is --javacopt not --javacopts and the link http://errorprone.info/docs 404s. There isn't a top level page for the docs so I altered the link to the first page which is installation.

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Reviewed-on: https://github.com/google/bazel/pull/401
MOS_MIGRATED_REVID=101931516

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