text: Title: Garbled word order in sentence about GraphQL
  Body: <!--
    Summarise the documentation change you’re suggesting in the Issue title.
  -->
  Word order in this sentence got a bit garbled:
  
  > GraphQL can introduce performance additional security and considerations due to their flexibility.
  
  I think I would also put this as the most important drawback of GraphQL and not the last one...
  It certainly seems a way bigger drawback to me than "wagtail does not support it natively"...
  
  ### Pertinent section of the Wagtail docs
  
  <!--
    Copy the section link here.
  -->
  https://docs.wagtail.org/en/stable/advanced_topics/headless.html#downsides-of-graphql
  