Fix comment

Author: sgonzalezMSFT

src/samples/cache/TokenCacheAspect.java

@@ -24,7 +24,7 @@ public void beforeCacheAccess(ITokenCacheAccessContext iTokenCacheAccessContext)
     @Override
     public void afterCacheAccess(ITokenCacheAccessContext iTokenCacheAccessContext) {
         data = iTokenCacheAccessContext.tokenCache().serialize();
-        // you could implement logic here to write changes to file here
+        // you could implement logic here to write changes to file
     }
 
     private static String readDataFromFile(String resource) {
@@ -34,7 +34,7 @@ private static String readDataFromFile(String resource) {
                     Files.readAllBytes(
                             Paths.get(path.toURI())));
         } catch (Exception ex){
-            System.out.println("Error reading data from file");
+            System.out.println("Error reading data from file: " + ex.getMessage());
             throw new RuntimeException(ex);
         }
     }

src/samples/confidential-client/ClientCredentialGrant.java

@@ -30,7 +30,7 @@ private static IAuthenticationResult acquireToken() throws Exception {
         // dummy data, so the acquireTokenSilently call will fail.
         TokenCacheAspect tokenCacheAspect = new TokenCacheAspect("sample_cache.json");
 
-        // This is the secret that is created in the Azure AD portal
+        // This is the secret that is created in the Azure portal when registering the application
         IClientCredential credential = ClientCredentialFactory.createFromSecret(CLIENT_SECRET);
         ConfidentialClientApplication cca =
                 ConfidentialClientApplication