clean up and adding javadoc

src/schematica_api/java/fi/dy/masa/litematica/schematic/placement/SchematicPlacementManager.java

@@ -24,7 +24,7 @@ public class SchematicPlacementManager {
     private final List<SchematicPlacement> schematicPlacements = new ArrayList<>();
 
     //in case of a java.lang.NoSuchMethodError try change the name of this method to getAllSchematicPlacements()
-    // there are inconsistencies in the litematica mod about the naming of this method
+    //there are inconsistencies in the litematica mod about the naming of this method
     public List<SchematicPlacement> getAllSchematicsPlacements() {
         return schematicPlacements;
     }