docs: describes variable formatting options
csv option in postgres/mysql docs and the regex option in the graphite docs
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@@ -38,7 +38,7 @@ documentation article for details on value escaping during interpolation.
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### Advanced Formatting Options
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In Grafana 5.0, an additional option was added to control the formatting of the interpolation.
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In Grafana 5.0, a new syntax for variables was introduced to control the formatting of the interpolation.
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Syntax: `${var_name:option}`
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