Fixed minor typo s/seperate/separate/

Fixed small typo in help text

public/app/plugins/datasource/influxdb/partials/query.options.html

@@ -45,7 +45,7 @@
 			<ul>
 				<li>$m = replaced with measurement name</li>
 				<li>$measurement = replaced with measurement name</li>
-				<li>$1 - $9 = replaced with part of measurement name (if you seperate your measurement name with dots)</li>
+				<li>$1 - $9 = replaced with part of measurement name (if you separate your measurement name with dots)</li>
 				<li>$col = replaced with column name</li>
 				<li>$tag_hostname = replaced with the value of the hostname tag</li>
 				<li>You can also use [[tag_hostname]] pattern replacement syntax</li>