Escape brackets in documentation

[VisruthSK]

✖ helpers-ppc.R:103: @description Could not resolve link to topic "0,1" in the dependencies or base packages.
ℹ If you haven't documented "0,1" yet, or just changed its name, this is normal. Once "0,1" is documented, this warning goes away.
ℹ Make sure that the name of the topic is spelled correctly.
ℹ Always list the linked package as a dependency.
ℹ Alternatively, you can fully qualify the link with a package name.
✖ helpers-ppc.R:524: @param Could not resolve link to topic "0,1" in the dependencies or base packages.
ℹ If you haven't documented "0,1" yet, or just changed its name, this is normal. Once "0,1" is documented, this warning goes away.
ℹ Make sure that the name of the topic is spelled correctly.
ℹ Always list the linked package as a dependency.
ℹ Alternatively, you can fully qualify the link with a package name.
✖ helpers-ppc.R:525: @param Could not resolve link to topic "0,1" in the dependencies or base packages.
ℹ If you haven't documented "0,1" yet, or just changed its name, this is normal. Once "0,1" is documented, this warning goes away.
ℹ Make sure that the name of the topic is spelled correctly.
ℹ Always list the linked package as a dependency.
ℹ Alternatively, you can fully qualify the link with a package name.

#' @param z1 Left evaluation point in [0,1]
#' @param z2 Right evaluation point in [0,1] with z2 > z1.

I think the brackets need to be escaped correctly so they aren't misunderstood to be an empty link.