Add distinct links and float tags to Region Map docs (#20361)

The float tags are required here to keep the subheadings on the same
page in the website. And, since link tags are global, we need to give them unique
names to avoid cross-linking errors.

These changes need to be backported to all 6.X releases.

docs/visualize/regionmap.asciidoc

@@ -7,24 +7,30 @@ These are also known as choropleth maps.
 
 image::images/regionmap.png[]
 
-
+[float]
+[[regionmap-configuration]]
 === Configuration
 
 To create a region map, you configure an inner join that joins the result of an Elasticsearch terms aggregation 
 and a reference vector file based on a shared key.
 
+[float]
 ==== Data
 
+[float]
 ===== Metrics
 
 Select any of the supported _Metric_ or _Sibling Pipeline Aggregations_.
 
+[float]
 ===== Buckets 
 
 Configure a _Terms_ aggregation. The term is the _key_ that is used to join the results to the vector data on the map.
 
+[float]
 ==== Options
 
+[float]
 ===== Layer Settings
 - *Vector map*: select from a list of vector maps. This list includes the maps that are hosted by the © https://www.elastic.co/elastic-maps-service[Elastic Maps Service],
 as well as your self-hosted layers that are configured in the *config/kibana.yml* file. To learn more about how to configure Kibana
@@ -33,9 +39,11 @@ to make self-hosted layers available, see the <<regionmap-settings,regionmap set
 When terms cannot be joined to any of the shapes in the vector layer because there is no exact match in the vector layer, Kibana will display a warning.
 To turn of these warnings, go to *Management/Kibana/Advanced Settings* and set `visualization:regionmap:showWarnings` to `false`.
 
+[float]
 ===== Style Settings
 - *Color Schema*: the color range used to color the shapes.
 
+[float]
 ===== Basic Settings
 - *Legend Position*: the location on the screen where the legend should be rendered.
 - *Show Tooltip*: indicates whether a tooltip should be displayed when hovering over a shape..  

docs/visualize/tilemap.asciidoc

@@ -8,7 +8,7 @@ to display map tiles. To use other tile service providers, configure the <<tilem
 in `kibana.yml`.
 
 [float]
-[[configuration]]
+[[tilemap-configuration]]
 === Configuration
 
 [float]