Update some URLs

Some were out of date, some were examples pointing to a personal
link, which were replaced with generic examples.

telethon/client/dialogs.py

@@ -569,10 +569,10 @@ class DialogMethods:
                         # <you> Your name didn't have any letters! Try again
                         conv.send_message("Your name didn't have any letters! Try again")
 
-                        # <usr> Lonami
+                        # <usr> Human
                         name = conv.get_response().raw_text
 
-                    # <you> Thanks Lonami!
+                    # <you> Thanks Human!
                     conv.send_message('Thanks {}!'.format(name))
         """
         return custom.Conversation(

telethon/client/messages.py

@@ -634,7 +634,7 @@ class MessageMethods:
             .. code-block:: python
 
                 # Markdown is the default
-                await client.send_message('lonami', 'Thanks for the **Telethon** library!')
+                await client.send_message('me', 'Hello **world**!')
 
                 # Default to another parse mode
                 client.parse_mode = 'html'
@@ -668,7 +668,7 @@ class MessageMethods:
                 # Matrix of inline buttons
                 await client.send_message(chat, 'Pick one from this grid', buttons=[
                     [Button.inline('Left'), Button.inline('Right')],
-                    [Button.url('Check this site!', 'https://lonamiwebs.github.io')]
+                    [Button.url('Check this site!', 'https://example.com')]
                 ])
 
                 # Reply keyboard