split phase1 features

specs/das/fork-choice.md

@@ -15,7 +15,9 @@
 
 ## Introduction
 
-This document is the beacon chain fork choice spec for part of Ethereum 2.0 Phase 1. The only change that we add from phase 0 is that we add a concept of "data dependencies"; a block is only eligible for consideration in the fork choice after a data availability test has been successfully completed for all dependencies. The "root" of a shard block for data dependency purposes is considered to be a DataCommitment object, which is a pair of a Kate commitment and a length.
+This document is the beacon chain fork choice spec for part of Ethereum 2.0 Phase 1. The only change that we add from phase 0 is that we add a concept of "data dependencies";
+a block is only eligible for consideration in the fork choice after a data availability test has been successfully completed for all dependencies.
+The "root" of a shard block for data dependency purposes is considered to be a DataCommitment object, which is a pair of a Kate commitment and a length.
 
 ## Dependency calculation