[fenix] Closes https://github.com/mozilla-mobile/fenix/issues/24276: add documentation to classes marked as UndocumentedPublicClass by lint

app/src/main/java/org/mozilla/fenix/library/history/HistoryAdapter.kt

@@ -11,6 +11,9 @@ import androidx.recyclerview.widget.DiffUtil
 import org.mozilla.fenix.selection.SelectionHolder
 import org.mozilla.fenix.library.history.viewholders.HistoryListItemViewHolder
 
+/**
+ * Adapter for the list of visited pages, that uses Paging 3 versions of the Paging library.
+ */
 class HistoryAdapter(
     private val historyInteractor: HistoryInteractor,
 ) : PagingDataAdapter<History, HistoryListItemViewHolder>(historyDiffCallback),

app/src/main/java/org/mozilla/fenix/library/history/HistoryDataSource.kt

@@ -10,6 +10,10 @@ import androidx.paging.PagingState
 import org.mozilla.fenix.components.history.HistoryDB
 import org.mozilla.fenix.components.history.PagedHistoryProvider
 
+/**
+ * PagingSource of History items, used in History Screen. It is the data source for the
+ * Flow<PagingData>, that provides HistoryAdapter with items to display.
+ */
 class HistoryDataSource(
     private val historyProvider: PagedHistoryProvider
 ) : PagingSource<Int, History>() {

app/src/main/java/org/mozilla/fenix/settings/sitepermissions/SitePermissionsExceptionsFragment.kt

@@ -148,6 +148,9 @@ class SitePermissionsViewHolder(
 ) :
     RecyclerView.ViewHolder(view)
 
+/**
+ * Adapter for the list of site permission exceptions.
+ */
 class ExceptionsAdapter(private val clickListener: View.OnClickListener) :
     PagingDataAdapter<SitePermissions, SitePermissionsViewHolder>(diffCallback) {