Rollup merge of #137125 - Urgau:reapply-empty-lines-relnotes, r=Mark-Simulacrum

Re-add missing empty lines in the releases notes

cf. rust-lang/rust#135797 (comment) and https://rust-lang.zulipchat.com/#narrow/channel/241545-t-release/topic/1.2E85/near/499937064

Author: matthiaskrgr