Add missing @example tags to Ronin::Support::Network::HTTP methods

[postmodern]

There should be @example tags with code examples showing how to call the Ronin::Support::Network::HTTP methods and what they return.

• self.proxy=
• self.user_agent=
• initialize
• self.connect
• self.connect_uri
• user_agent=
• cookie=
• response_status
• ok?
• response_headers
• server_header
• powered_by_header
• response_body
• copy
• delete
• get
• get_headers
• get_cookies
• get_body
• head
• lock
• mkcol
• move
• options
• allowed_methods
• patch
• post
• post_headers
• post_body
• propfind
• proppatch
• put
• trace
• unlock
• self.response_status
• self.ok?
• self.response_headers
• self.server_header
• self.powered_by_header
• self.response_body
• self.copy
• self.delete
• self.get
• self.get_headers
• self.get_cookies
• self.get_body
• self.head
• self.lock
• self.mkcol
• self.move
• self.options
• self.allowed_methods
• self.patch
• self.post
• self.post_headers
• self.post_body
• self.propfind
• self.proppatch
• self.put
• self.trace
• self.unlock

Obviously this will take a while, with multiple commits and PRs to complete.