Renamed "Period" to "Min period" in CloudWatch query editor (#10665)

public/app/plugins/datasource/cloudwatch/partials/query.parameter.html

 <div class="gf-form-inline">
 	<div class="gf-form">
-		<label class="gf-form-label query-keyword width-7">Metric</label>
+		<label class="gf-form-label query-keyword width-8">Metric</label>
 
 		<metric-segment segment="regionSegment" get-options="getRegions()" on-change="regionChanged()"></metric-segment>
 		<metric-segment segment="namespaceSegment" get-options="getNamespaces()" on-change="namespaceChanged()"></metric-segment>
@@ -22,7 +22,7 @@
 
 <div class="gf-form-inline">
 	<div class="gf-form">
-		<label class="gf-form-label query-keyword width-7">Dimensions</label>
+		<label class="gf-form-label query-keyword width-8">Dimensions</label>
 		<metric-segment ng-repeat="segment in dimSegments" segment="segment" get-options="getDimSegments(segment, $index)" on-change="dimSegmentChanged(segment, $index)"></metric-segment>
 	</div>
 
@@ -33,9 +33,9 @@
 
 <div class="gf-form-inline">
 	<div class="gf-form">
-		<label class="gf-form-label query-keyword width-7">
-			Period
-			<info-popover mode="right-normal">Interval between points in seconds</info-popover>
+		<label class="gf-form-label query-keyword width-8">
+			Min period
+			<info-popover mode="right-normal">Minimum interval between points in seconds</info-popover>
 		</label>
 		<input type="text" class="gf-form-input" ng-model="target.period" spellcheck='false' placeholder="auto" ng-model-onblur ng-change="onChange()" />
 	</div>