Style[bta_profile]: add clarifying comments

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/modloaders/BTAUtils.java

@@ -54,6 +54,9 @@ public class BTAUtils {
     private static List<BTAVersion> createVersionList(List<String> versionStrings, String buildType) {
         ListIterator<String> iterator = versionStrings.listIterator(versionStrings.size());
         ArrayList<BTAVersion> btaVersions = new ArrayList<>(versionStrings.size());
+        // The original list is guaranteed to be in ascending order - the earliest versions
+        // are at the top, but for user convenience we need to put the newest versions at the top,
+        // so the BTAVersion list is made from the reverse of the string list.
         while(iterator.hasPrevious()) {
             String version = iterator.previous();
             if(version == null) continue;
@@ -79,6 +82,8 @@ public class BTAUtils {
         List<String> untestedVersions = new ArrayList<>();
         for(String version : stringVersions) {
             if(version == null) break;
+            // Checking for presence in testing array here to avoid accidentally adding nonexistent
+            // versions if some of them end up getting removed.
             if(BTA_TESTED_VERSIONS.contains(version)) {
                 testedVersions.add(version);
             }else {