DEV: Correct spelling mistakes in comments

lib/auth/authenticator.rb

@@ -52,7 +52,7 @@ class Auth::Authenticator
     false
   end
 
-  # can exising discourse users connect this provider to their accounts
+  # can existing discourse users connect this provider to their accounts
   def can_connect_existing_user?
     false
   end

lib/auth/managed_authenticator.rb

@@ -19,7 +19,7 @@ class Auth::ManagedAuthenticator < Auth::Authenticator
     info["email"] || info["nickname"] || info["name"]
   end
 
-  # These three methods are designed to be overriden by child classes
+  # These three methods are designed to be overridden by child classes
   def match_by_email
     true
   end

lib/tasks/emails.rake

@@ -11,7 +11,7 @@ def process_popmail(popmail)
   end
 end
 
-desc "use this task to import a mailbox into Disourse"
+desc "use this task to import a mailbox into Discourse"
 task "emails:import" => :environment do
   begin
     unless SiteSetting.email_in
@@ -72,7 +72,7 @@ task 'emails:test', [:email] => [:environment] do |_, args|
         Sending mail with Gmail is a violation of their terms of service.
 
         Sending with G Suite might work, but it is not recommended. For information see:
-        https://meta.discourse.org/t/dscourse-aws-ec2-g-suite-troubleshoting/62931?u=pfaffman
+        https://meta.discourse.org/t/discourse-aws-ec2-g-suite-troubleshooting/62931?u=pfaffman
 
         ========================= CONTINUING TEST ============================
       STR