add some documentation for visiting entity (#38475)

* add some documentation for visiting entity

to prevent someone from spending 5 minutes diving into the codebase

* reviews

Co-authored-by: LaCumbiaDelCoronavirus <90893484+LaCumbiaDelCoronavirus@users.noreply.github.com>

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Co-authored-by: LaCumbiaDelCoronavirus <90893484+LaCumbiaDelCoronavirus@users.noreply.github.com>

Content.Shared/Mind/MindComponent.cs

@@ -55,6 +55,9 @@ public sealed partial class MindComponent : Component
     [ViewVariables]
     public bool IsVisitingEntity => VisitingEntity != null;
 
+    /// <summary>
+    /// The entity that this mind may be currently visiting. Used, for example, to allow admin ghosting to not make the owner's body catatonic, as opposed to when normally ghosting.
+    /// </summary>
     [DataField, AutoNetworkedField, Access(typeof(SharedMindSystem))]
     public EntityUid? VisitingEntity { get; set; }