remove reference to unsupported command

src/feature-lifecycle/api-change-proposals.md

@@ -13,9 +13,9 @@ being solved and concrete motivating examples.
 You can create an ACP in the `rust-lang/libs-team` repo using [this issue template](https://github.com/rust-lang/libs-team/issues/new?assignees=&labels=api-change-proposal%2C+T-libs-api&template=api-change-proposal.md&title=%28My+API+Change+Proposal%29).
 
 Once a t-libs-api team member has reviewed the ACP and judged that it should
-move forward they will second the ACP (via `@rfcbot second`) and initiate an
-ICP (inital comment period). This initial comment period is intended to give
-other stake holders a chance to participate in the initial discussion prior to
-starting the implementation. Once this ICP has completed you should proceed
-with the implementation of your proposal and then move on to the next step of
-the feature lifecycle, creating a tracking issue.
+move forward they will second the ACP and initiate an ICP (inital comment
+period). This initial comment period is intended to give other stake holders a
+chance to participate in the initial discussion prior to starting the
+implementation. Once this ICP has completed you should proceed with the
+implementation of your proposal and then move on to the next step of the
+feature lifecycle, creating a tracking issue.