[lib] Wrote missing documentation

Author: mta452

tehreer-android/src/main/java/com/mta/tehreer/font/FontFile.java

@@ -142,6 +142,11 @@ private void loadTypefaces() {
         mTypefaces = allTypefaces;
     }
 
+    /**
+     * Returns named typefaces of this font file.
+     *
+     * @return Named typefaces of this font file.
+     */
     public List<Typeface> getTypefaces() {
         if (mTypefaces == null) {
             synchronized (this) {

tehreer-android/src/main/java/com/mta/tehreer/sfnt/ShapingResult.java

@@ -223,10 +223,21 @@ public int getGlyphCount() {
         return new UIntPtrBufferIntList(this, pointer, size);
     }
 
+    /**
+     * Returns a list of caret edges having caret stop on every code unit.
+     *
+     * @return A list of caret edges having caret stop on every code unit.
+     */
     public @NonNull FloatList getCaretEdges() {
         return getCaretEdges(null);
     }
 
+    /**
+     * Returns a list of caret edges.
+     *
+     * @param caretStops An array for caret stops of the code units represented by this object.
+     * @return A list of caret edges.
+     */
     public @NonNull FloatList getCaretEdges(boolean[] caretStops) {
         int charCount = getCharCount();
         float[] caretEdges = new float[charCount + 1];