Added exists keyword to the modifiers documentation page #98
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Hello,
when I was developing the RSA NetWitness pySigma backend I noticed the
field_exists_expression
andfield_not_exists_expression
variables but couldn't find any documentation about theexists
keyword. Then I searched the backend for the use of the keyword to figure out the correct way to specify theexists
modifier in the yaml of a sigma rule.This PR will update the documentation to include the modifier.