[DOCS] Add ingest operation summaries

[lcawl]

Relates to #2635

This PR edits the summaries in https://www.elastic.co/docs/api/doc/elasticsearch-serverless/group/endpoint-ingest based on https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest-apis.html

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ingest.delete_geoip_database	🟢	1/1	1/1
ingest.delete_pipeline	🟢	15/15	15/15
ingest.geo_ip_stats	🟢	1/1	1/1
ingest.get_geoip_database	🟢	6/6	6/6
ingest.get_pipeline	🟢	22/22	22/22
ingest.processor_grok	🟢	1/1	1/1
ingest.put_geoip_database	🟢	3/3	3/3
ingest.put_pipeline	🟢	60/60	60/60
ingest.simulate	🟢	10/10	10/10

You can validate these APIs yourself by using the make validate target.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
ingest.delete_geoip_database	🟢	1/1	1/1
ingest.delete_pipeline	🟢	15/15	15/15
ingest.geo_ip_stats	🟢	1/1	1/1
ingest.get_geoip_database	🟢	6/6	6/6
ingest.get_pipeline	🟢	22/22	22/22
ingest.processor_grok	🟢	1/1	1/1
ingest.put_geoip_database	🟢	3/3	3/3
ingest.put_pipeline	🟢	60/60	60/60
ingest.simulate	🟢	10/10	10/10

You can validate these APIs yourself by using the make validate target.

[marciw]

LGTM 🚗