Update the description of var_val

doc/EFFECT_ON_CONDITION.md

@@ -112,7 +112,20 @@ Variable object is a value, that changes due some conditions. Variable can be in
 - `global_val` - variable, that is store in the world, and won't be lost until you delete said world
 - `context_val` - variable, that was delivered from some another entity; For example, EVENT type EoCs can deliver specific variables contributor can use to perform specific checks:
 `character_casts_spell` event, that is called every time, you guess it, character cast spell, it also store information about spell name, difficulty and damage, so contributor can create a specific negative effect for every spell casted, depending on this values; Generalized EoCs can also create and use context variables; math equivalent is variable name with `_`
-- `var_val` - var_val is a unique variable object in the fact that it attempts to resolve the variable stored inside a context variable. So if you had
+- `var_val` - var_val is a unique variable object in the fact that it attempts to resolve the variable stored inside a context variable. The table below illustrates how values are resolved based on their prefixes:
+
+| Prefix of the value in var_val| Resolved as      |
+|------------------|------------------|
+| `g_` or `global_`| global_val       |
+| No Prefix        | global_val       |
+| `_`, `context_`  | context_val      |
+| `u_`             | u_val            |
+| `n_` or `npc_`   | npc_val          |
+| `v_`             | var_val          |
+
+In practice, `{ "var_val": "name" }` can be understood as `{ "global_val/context_val/u_val/npc_val": { "context_val": "name" } }`.
+
+So if you had
 
 | Name | Type | Value |
 | --- | --- | --- |
@@ -127,8 +140,6 @@ Variable object is a value, that changes due some conditions. Variable can be in
 For example, imagine you have context variable `{ "context_val": "my_best_spell" }`, and this `my_best_gun` variable contain text `any_random_gun`; also you have a `{ "global_val": "any_random_gun" }`, and this `any_random_gun` variable happened to contain text `ak47`
 With both of this, you can use effect `"u_spawn_item": { "var_val": "my_best_gun" }`, and the game will spawn `ak47`, since it is what is stored inside `my_best_gun` global variable
 
-The values for var_val use the same syntax for scope that math [variables](#variables) do.
-
 Examples:
 
 you add morale equal to `how_good` variable