docs: Updated Promtail to Alloy (backport release-3.0.x) (#14431)

Co-authored-by: Jay Clifford <45856600+Jayclifford345@users.noreply.github.com>

docs/sources/setup/install/_index.md

@@ -9,20 +9,24 @@ weight: 200
 
 # Install Loki
 
-There are several methods of installing Loki and Promtail:
+There are several methods of installing Loki:
 
 - [Install using Helm (recommended)]({{< relref "./helm" >}})
 - [Install using Tanka]({{< relref "./tanka" >}})
 - [Install using Docker or Docker Compose]({{< relref "./docker" >}})
 - [Install and run locally]({{< relref "./local" >}})
 - [Install from source]({{< relref "./install-from-source" >}})
 
+Alloy:
+- [Install Alloy](https://grafana.com/docs/alloy/latest/set-up/install/)
+- [Ingest Logs with Alloy]({{< relref "../../send-data/alloy" >}})
+
 ## General process
 
 In order to run Loki, you must:
 
-1. Download and install both Loki and Promtail.
+1. Download and install both Loki and Alloy.
 1. Download config files for both programs.
 1. Start Loki.
-1. Update the Promtail config file to get your logs into Loki.
-1. Start Promtail.
+1. Update the Alloy config file to get your logs into Loki.
+1. Start Alloy.