anchor.diff:  
   [discrete]
   [[eql-syntax-escape-a-field-name]]
  -=== Escape a field name
  +==== Escape a field name
   
   Use enclosing backticks (+++`+++) to escape field names that:
   
  
positive.code: 
  [discrete]
  [[eql-syntax-math-operators]]
  === Math operators
  
  [source,eql]
  ----
  
negative.code: 
  [discrete]
  [[eql-with-maxspan-keywords]]
  ==== `with maxspan` statement
  
  You can use `with maxspan` to constrain a sequence to a specified timespan. All
  events in a matching sequence must occur within this duration, starting at the
  