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Document backtick escaping in pipeline rules
Currently the option to use backticks in message field references to support special characters or reserved words as field names is undocumented.
See https://github.com/Graylog2/graylog-plugin-pipeline-processor/blob/191e3b98a5e23a308fe16d14eaf9cf7936fe6b0e/plugin/src/test/resources/org/graylog/plugins/pipelineprocessor/parser/messageRefQuotedField.txt#L2 for an example.