Update schema-static.mjs

Some additional notes on the adjusted completion percentage. Also removes notes about standard GQL nullable types as it doesn't make logical sense for that to be part of the Achievement type documentation.

Author: Razzmatazzz

schema-static.mjs

@@ -1,10 +1,6 @@
 export default `
 """
 **In-game achievements players can earn by completing specific objectives.**
-
-- Fields with '!' (e.g., String!) are required (non-nullable).
-- Fields without '!' (e.g., String) are optional (nullable).
-This follows standard GraphQL notation.
 """
 type Achievement {
   """
@@ -28,7 +24,7 @@ type Achievement {
   """
   playersCompletedPercent: Float!
   """
-  Statistically adjusted percentage that accounts for active players, providing a more representative completion rate.
+  Statistically adjusted percentage that accounts for active players, providing a more representative completion rate. Uses the percentage completion of Welcome to Tarkov as the baseline under the assumption that all active accounts have died once.
   """
   adjustedPlayersCompletedPercent: Float
   """