Chem guidebook (#17123)

* im good at atomizing. welcome to half-finished chem guides.

* wagh

* e

* save work

* aa

* woweee UI

* finishing the last of it

* don't actually update the engine :(

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Co-authored-by: moonheart08 <moonheart08@users.noreply.github.com>

Content.Server/Chemistry/ReagentEffects/ModifyBloodLevel.cs

@@ -2,6 +2,7 @@
 using Content.Server.Body.Systems;
 using Content.Shared.Chemistry.Reagent;
 using Content.Shared.FixedPoint;
+using Robust.Shared.Prototypes;
 
 namespace Content.Server.Chemistry.ReagentEffects;
 
@@ -13,6 +14,10 @@ public sealed class ModifyBloodLevel : ReagentEffect
     [DataField("amount")]
     public FixedPoint2 Amount = 1.0f;
 
+    protected override string? ReagentEffectGuidebookText(IPrototypeManager prototype, IEntitySystemManager entSys)
+        => Loc.GetString("reagent-effect-guidebook-modify-blood-level", ("chance", Probability),
+            ("deltasign", MathF.Sign(Amount.Float())));
+
     public override void Effect(ReagentEffectArgs args)
     {
         if (args.EntityManager.TryGetComponent<BloodstreamComponent>(args.SolutionEntity, out var blood))