Clean up new HTNs tasks (#28469)

* Clean up new HTNs tasks

* Added docs to math operations

Content.Server/NPC/HTN/PrimitiveTasks/Operators/Math/AddFloatOperator.cs

@@ -4,13 +4,14 @@ using System.Threading.Tasks;
 namespace Content.Server.NPC.HTN.PrimitiveTasks.Operators.Math;
 
 /// <summary>
-/// Gets the key, and adds the value to that float
+/// Added <see cref="AddFloatOperator.Amount"/> to float value for the
+/// specified <see cref="AddFloatOperator.TargetKey"/> in the <see cref="NPCBlackboard"/>.
 /// </summary>
 public sealed partial class AddFloatOperator : HTNOperator
 {
     [Dependency] private readonly IEntityManager _entManager = default!;
 
-    [DataField(required: true)]
+    [DataField(required: true), ViewVariables]
     public string TargetKey = string.Empty;
 
     [DataField, ViewVariables(VVAccess.ReadWrite)]