Removed the "What is it" documentation heading.
Removed the "What is it" documentation heading.

buildkite/agent,buildkite/agent,es/agent,tommeier/agent,joelmoss/agent,Shopify/agent,grosskur/agent,joelmoss/agent,Shopify/agent,grosskur/agent,es/agent,Jasperswaagman/agent,tommeier/agent,grosskur/agent,Jasperswaagman/agent,tommeier/agent,joelmoss/agent,es/agent,buildkite/agent,Shopify/agent,Jasperswaagman/agent