[Docs] Update tophits-aggregation.asciidoc (#28273)

chaojiwan · Christoph Büscher · commit 4746d30911c3 · 2018-01-18T18:06:46.000+01:00
diff --git a/docs/reference/aggregations/metrics/tophits-aggregation.asciidoc b/docs/reference/aggregations/metrics/tophits-aggregation.asciidoc
@@ -1,5 +1,5 @@
 [[search-aggregations-metrics-top-hits-aggregation]]
-=== Top hits Aggregation
+=== Top Hits Aggregation
 
 A `top_hits` metric aggregator keeps track of the most relevant document being aggregated. This aggregator is intended
 to be used as a sub aggregator, so that the top matching documents can be aggregated per bucket.
