Engineering guidebook megaupdate v2 (#33062)

Significantly updates the Engineering guidebook (more explicitly the Atmos section) to have a lot more relevant and useful information.

Right now engineering has been getting update after update with no real change to the relevant guidebook entry. This has lead to a lot of out of date information and bad practices being prevalent in the guidebook, something that pains me to read.

Content.Server/Atmos/Piping/Trinary/Components/PressureControlledValveComponent.cs

@@ -1,4 +1,5 @@
 using Content.Shared.Atmos;
+using Content.Shared.Guidebook;
 
 namespace Content.Server.Atmos.Piping.Trinary.Components
 {
@@ -27,6 +28,7 @@ namespace Content.Server.Atmos.Piping.Trinary.Components
 
         [ViewVariables(VVAccess.ReadWrite)]
         [DataField("threshold")]
+        [GuidebookData]
         public float Threshold { get; set; } = Atmospherics.OneAtmosphere;
 
         [DataField("maxTransferRate")]