#595 Update warning messages to be more informative

Author: DmitryKolinchuk

src/SIM.Sitecore9Installer.Tests/Validation/Validators/PrerequisitesDownloadLinksValidatorTests.cs

@@ -11,9 +11,9 @@ namespace SIM.Sitecore9Installer.Tests.Validation.Validators
 {
   public class PrerequisitesDownloadLinksValidatorTests
   {
-    private const string KnownIssueMessage = "{0}: the '{1}' parameter contains the following invalid link that is not accessible:\n\n{2}\n\nThis behavior looks to be related to the following known issue:\n\n{3}\n\nPlease try to apply the solution mentioned there.";
+    private const string KnownIssueMessage = "{0}: the '{1}' parameter contains the following link that is not accessible:\n\n{2}\n\nThis behavior looks to be related to the following known issue:\n\n{3}\n\nPlease try to apply the solution mentioned there.";
 
-    private const string InvalidLinkMessage = "{0}: the '{1}' parameter contains the following invalid link that is not accessible:\n\n{2}\n\nThis behavior may occur due to similar symptoms described in the following known issue:\n\n{3}";
+    private const string InvalidLinkMessage = "{0}: the '{1}' parameter contains the following link that is not accessible:\n\n{2}\n\nPlease check the Internet connection and the link accessibility in a browser.\n\nThis behavior may also occur due to similar symptoms described in the following known issue:\n\n{3}";
 
     private const string InvalidValueMessage = "{0}: the '{1}' parameter contains the following invalid value:\n\n{2}\n\nIt should contain download link that starts with '{3}'.";
 

src/SIM.Sitecore9Installer/Validation/Validators/PrerequisitesDownloadLinksValidator.cs

@@ -44,13 +44,13 @@ protected override IEnumerable<ValidationResult> GetErrorsForTask(Task task, IEn
                 if (installParam.Name == this.WebPlatformDownload)
                 {
                   yield return new ValidationResult(ValidatorState.Warning,
-                    $"{TaskName}: the '{installParam.Name}' parameter contains the following invalid link that is not accessible:\n\n{installParam.Value}\n\nThis behavior looks to be related to the following known issue:\n\n{KnownIssueLink}\n\nPlease try to apply the solution mentioned there.",
+                    $"{TaskName}: the '{installParam.Name}' parameter contains the following link that is not accessible:\n\n{installParam.Value}\n\nThis behavior looks to be related to the following known issue:\n\n{KnownIssueLink}\n\nPlease try to apply the solution mentioned there.",
                     null);
                 }
                 else
                 {
                   yield return new ValidationResult(ValidatorState.Warning,
-                    $"{TaskName}: the '{installParam.Name}' parameter contains the following invalid link that is not accessible:\n\n{installParam.Value}\n\nThis behavior may occur due to similar symptoms described in the following known issue:\n\n{KnownIssueLink}",
+                    $"{TaskName}: the '{installParam.Name}' parameter contains the following link that is not accessible:\n\n{installParam.Value}\n\nPlease check the Internet connection and the link accessibility in a browser.\n\nThis behavior may also occur due to similar symptoms described in the following known issue:\n\n{KnownIssueLink}",
                     null);
                 }
               }