docs: added todos on pending assertions

These todos should be reviewed together with the skipped tests on a
future issue

Author: tuliomir

__tests__/integration/melt-tokens.test.js

@@ -50,7 +50,7 @@ describe('melt tokens', () => {
     expect(response.status).toBe(200);
     expect(response.body.success).toBe(false);
 
-    // Even though the result is correct, the error thrown is not related. Should be fixed later.
+    // TODO: Even though the result is correct, the error thrown is not related.
     // expect(response.body.error).toContain('invalid');
     done();
   });

__tests__/integration/mint-tokens.test.js

@@ -45,7 +45,7 @@ describe('mint token', () => {
     expect(response.status).toBe(200);
     expect(response.body.success).toBe(false);
 
-    // Even though the result is correct, the error thrown is not related. Should be fixed later.
+    // TODO: Even though the result is correct, the error thrown is not related.
     // expect(response.body.message).toContain('invalid');
     done();
   });