Overwatch · Mid Tier
No rationale is given for these two changes. Per the document's stated policy, an unexplained change simply means the hero should be slightly toned up or toned down.
For each hero in B and C tier, slightly buff one part of the kit and slightly nerf another. The goal is to reduce the unfair parts of a hero while lessening their weaknesses.
Each entry lists the move or ability affected, the adjustment itself, and — where the analysis states one — the problem it is meant to solve and the reasoning behind it.
Widowmaker is one of Overwatch's entries — the full tier-by-tier breakdown covers the whole roster.