DOCS: Correct rendering of sub headings in composite aggs doc
@@ -224,7 +224,7 @@ Time values can also be specified via abbreviations supported by <<time-units,ti
Note that fractional time values are not supported, but you can address this by shifting to another
time unit (e.g., `1.5h` could instead be specified as `90m`).
-====== Format
+*Format*
Internally, a date is represented as a 64 bit number representing a timestamp in milliseconds-since-the-epoch.
These timestamps are returned as the bucket keys. It is possible to return a formatted date string instead using
@@ -257,7 +257,7 @@ GET /_search
<1> Supports expressive date <<date-format-pattern,format pattern>>
-====== Time Zone
+*Time Zone*
Date-times are stored in Elasticsearch in UTC. By default, all bucketing and
rounding is also done in UTC. The `time_zone` parameter can be used to indicate
