docs: two comments state the rule rather than its history (#6277)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/update/data/UpdateRepository.kt

@@ -62,7 +62,7 @@ class UpdateRepository(
     private val installedCode: Long,
     private val installedName: String,
     private val offers: Boolean,
-    // Where the updater before this one kept its download, never cleaned up.
+    // A download left by older builds of the app, which nothing else removes.
     private val legacyApk: File? = null,
 ) {
     private val turns = Mutex()

internal/server/release_version_test.go

@@ -578,8 +578,8 @@ func TestVersionName_AndroidSourcesCount(t *testing.T) {
 
 // The app offers an update whenever the server's APK has a different name
 // from its own, so the APK's name must move for Android commits and ONLY for
-// them. Named from the whole repo, every server-only deploy offered each
-// phone a rebuild of the app it already had.
+// them. A name taken from the whole repo would offer every phone a rebuild of
+// the app it already has on each server-only deploy.
 func TestApkName_MovesOnlyForAndroidCommits(t *testing.T) {
 	const (
 		app    = "1757443736" // 2025.09.09.1848