chore: add comment to config about format

Closes #1231

src/main/java/com/klikli_dev/occultism/config/OccultismServerConfig.java

@@ -180,7 +180,7 @@ public RitualSettings(ModConfigSpec.Builder builder) {
                                             "(very very) many rituals are running.")
                             .define("enableRemainingIngredientCountMatching", false);
             this.ritualDurationMultiplier =
-                    builder.comment("Set a value below 1.0 to speed up rituals.")
+                    builder.comment("Set a value below 1.0 to speed up rituals. Please ensure to use a preceding 0 for values below 1.0, e.g. '0.05' instead of '.05', otherwise Nightconfig (NeoForge's config sytem) will reset the value to 1.0.")
                             .defineInRange("ritualDurationMultiplier", 1.0, 0.05, Double.MAX_VALUE);
 
             builder.pop();