Remove uneeded newline

Author: josevalim

lib/elixir/pages/references/operators.md

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 [`!=`](`!=/2`) and [`!==`](`!==/2`) act as the negation of [`==`](`==/2`) and [`===`](`===/2`), respectively.
 
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 ## Operator precedence and associativity
 
 The following is a list of all operators that Elixir is capable of parsing, ordered from higher to lower precedence, alongside their associativity: