Updated FAQ (markdown)

FAQ.md

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-asd
+Q. How do I use the second y axis, secondYAxis function does not work
+
+A. You can switch any series to the second y axis by clicking on the colored line to left of the series name in the legend below the graph. Alternately, use the "Display Styles" > "Series Specific overrides" to define an alias or regex + "Y-axis: 2" to move metrics to the right Axis
+
+Q. How do I exit graph edit mode?
+
+A. Hit the escape key or click the graph title and select edit again.
+
+Q. How do I delete a dashboard?
+
+A. Click that dashboard page's jag,then bottom will have an item "delete dashboard"