[DOCS] Correct table anchor and header for Asciidoctor migration'

Author: jrodewig

docs/reference/aggregations/pipeline/percentiles-bucket-aggregation.asciidoc

@@ -21,7 +21,7 @@ A `percentiles_bucket` aggregation looks like this in isolation:
 
 
 [[sum-bucket-params]]
-.`sum_bucket` Parameters
+.`percentiles_bucket` Parameters
 [options="header"]
 |===
 |Parameter Name |Description |Required |Default Value