Update according to code review

- updated function name
- updated message in pop up

Author: yaelirub

WordPressAuthenticator/Authenticator/WordPressAuthenticatorDelegateProtocol.swift

@@ -20,8 +20,8 @@ public protocol WordPressAuthenticatorDelegate: class {
     ///
     var supportEnabled: Bool { get }
 
-    /// Returns true if there is a default WordPress.com account in the app./
-    var defaultWordPressComAccountExists: Bool { get }
+    /// Returns true if there isn't a default WordPress.com account connected in the app.
+    var allowWPComLogin: Bool { get }
 
     /// Signals the Host App that a new WordPress.com account has just been created.
     ///

WordPressAuthenticator/Signin/LoginSiteAddressViewController.swift

@@ -187,7 +187,7 @@ class LoginSiteAddressViewController: LoginViewController, NUXKeyboardResponder
             let service = WordPressComBlogService()
             service.fetchSiteInfo(for: siteAddress, success: { [weak self] siteInfo in
                 self?.loginFields.meta.siteInfo = siteInfo
-                if WordPressAuthenticator.shared.delegate?.defaultWordPressComAccountExists == true {
+                if WordPressAuthenticator.shared.delegate?.allowWPComLogin == false {
                     self?.promptUserToLogoutBeforeConnectingWPComSite()
                     self?.configureViewLoading(false)
                 } else {
@@ -235,7 +235,7 @@ class LoginSiteAddressViewController: LoginViewController, NUXKeyboardResponder
 
     @objc private func promptUserToLogoutBeforeConnectingWPComSite() {
         let acceptActionTitle = NSLocalizedString("OK", comment: "Alert dismissal title")
-        let message = NSLocalizedString("Please logout before connecting to a different wordpress.com site", comment: "Message for alert to prompt user to logout before connecting to a different wxordpress.com site")
+        let message = NSLocalizedString("Please log out before connecting to a different wordpress.com site", comment: "Message for alert to prompt user to logout before connecting to a different wordpress.com site.")
         let alertController = UIAlertController(title: nil, message: message, preferredStyle: .alert)
         alertController.addDefaultActionWithTitle(acceptActionTitle)
         present(alertController, animated: true)