title: edit a discord.py embed as if someone has "commented" on it
body: <p>I have a command that sends an embed based on a user's message... I want to be able to add content to the embed message with a command as if I were commenting. Here's an example from a bot made by Discord:</p>
  <p><img src="https://i.stack.imgur.com/f7H0p.png" alt="embed &quot;can reproduce&quot; field has comments" /></p>
  <p>As you can see in the image people have left comments on the embed. I want to be able to do exactly that: keep original content, add more content with a command.<br />
  I know how to edit messages but I cannot find anything about adding content in a specific embed field.</p>
  <p>Some example code so you can understand my thought process:</p>
  <pre class="lang-py prettyprint-override"><code>@client.command()
  async def comment(ctx, message, *, args):
      messagec = await ctx.fetch_message(message)
      embed = discord.Embed(title=messagec.content['title'], description=messagec.content['description'])
      value = f'\n`{ctx.message.author.name}: {args}`'
      embed.add_value(name='comments', value=value)
      await message.edit(embed=embed)
  </code></pre>
  <p>Please don't respond telling me why this code won't work I know why this is just an example so it's easier to understand my thought process.</p>