docs: add documentation for findLast method

Author: ahmad-kashkoush

lib/node_modules/@stdlib/array/fixed-endian-factory/README.md

@@ -908,6 +908,52 @@ var str = arr.join( 0 );
 // returns '10203'
 ```
 
+<a name="method-find-last"></a>
+
+#### TypedArray.prototype.findLast( predicate\[, thisArg] )
+
+Returns the last element in an array for which a predicate function returns a truthy value.
+
+```javascript
+var Float64ArrayFE = fixedEndianFactory( 'float64' );
+function predicate( element ) {
+    return element < 0;
+}
+
+var arr = new Float64ArrayFE( 'little-endian', [ -1.0, 2.0, -4.0, 3.0 ] );
+
+var res = arr.findLast( predicate );
+// returns -4.0
+```
+
+The `predicate` function is provided three arguments:
+
+-   **value**: current array element.
+-   **index**: current array element index.
+-   **arr**: the array on which this method was called.
+
+To set the function execution context, provide a `thisArg`
+
+```javascript
+var Float64ArrayFE = fixedEndianFactory( 'float64' );
+function predicate( v ) {
+    this.count += 1;
+    return ( v < 0 );
+}
+
+var arr = new Float64ArrayFE( 'little-endian', [ -1.0, 2.0, 3.0 ] );
+
+var context = {
+    'count': 0
+};
+
+var z = arr.findLast( predicate, context );
+// returns -1.0
+
+var count = context.count;
+// returns 3
+```
+
 </section>
 
 <!-- /.usage -->