Fix typo, re: #6415

docs/x-axis-aggs.asciidoc

@@ -28,7 +28,7 @@ remove a range.
 or bottom _n_ elements of a  given field to display, ordered by count or a custom metric.
 *Filters*:: You can specify a set of {ref}/search-aggregations-bucket-filters-aggregation.html[_filters_] for the data. 
 You can specify a filter as a query string or in JSON format, just as in the Discover search bar. Click *Add Filter* to 
-add another filter. Click the images:labelbutton.png[] *label* button to open the label field, where you can type in a 
+add another filter. Click the image:labelbutton.png[] *label* button to open the label field, where you can type in a 
 name to display on the visualization.
 *Significant Terms*:: Displays the results of the experimental 
 {ref}/search-aggregations-bucket-significantterms-aggregation.html[_significant terms_] aggregation.