Fix titles of GeoIP and User Agent processor docs

This commit makes the titles of the new GeoIP and User Agent processor
docs look more like the titles of the docs for other processors.

docs/plugins/ingest-geoip.asciidoc

@@ -2,10 +2,10 @@
 === Ingest `geoip` Processor Plugin
 
 The `geoip` processor is no longer distributed as a plugin, but is now a module
-distributed by default with Elasticsearch. See
-{ref}/ingest-geoip.html[Ingest `geoip` processor] for more details.
+distributed by default with Elasticsearch. See the
+{ref}/geoip-processor.html[GeoIP processor] for more details.
 
 [[using-ingest-geoip]]
 ==== Using the `geoip` Processor in a Pipeline
 
-See {ref}/ingest-geoip.html#using-ingest-geoip[using `ingest-geoip`].
+See {ref}/geoip-processor.html#using-ingest-geoip[using `ingest-geoip`].

docs/plugins/ingest-user-agent.asciidoc

@@ -2,6 +2,6 @@
 === Ingest `user_agent` Processor Plugin
 
 The `user_agent` processor is no longer distributed as a plugin, but is now a module
-distributed by default with Elasticsearch. See
-{ref}/ingest-user-agent.html[Ingest `user_agent` processor] for more details.
+distributed by default with Elasticsearch. See the
+{ref}/user-agent.html[User Agent processor] for more details.
 

docs/reference/ingest/processors/geoip.asciidoc

@@ -1,5 +1,5 @@
-[[ingest-geoip]]
-=== Ingest `geoip` Processor
+[[geoip-processor]]
+=== GeoIP Processor
 
 The `geoip` processor adds information about the geographical location of IP addresses, based on data from the Maxmind databases.
 This processor adds this information by default under the `geoip` field. The `geoip` processor can resolve both IPv4 and

docs/reference/ingest/processors/user-agent.asciidoc

@@ -1,5 +1,5 @@
-[[ingest-user-agent]]
-=== Ingest user agent processor
+[[user-agent]]
+=== User Agent processor
 
 The `user_agent` processor extracts details from the user agent string a browser sends with its web requests.
 This processor adds this information by default under the `user_agent` field.