minor refactor (release CCtx 1st) and comment clarification
minor refactor (release CCtx 1st) and comment clarification

Cyan4973/zstd,inikep/zstd,Majlen/zstd,Cyan4973/zstd,ds77/zstd,Cyan4973/zstd,inikep/zstd,Cyan4973/zstd,ds77/zstd,inikep/zstd,ds77/zstd,Majlen/zstd,Majlen/zstd,ds77/zstd,Majlen/zstd,inikep/zstd,Cyan4973/zstd