fix(docs): Clarify that pre-built layers are provided (open-telemetry#1381)

Author: gshpychka

README.md

@@ -26,7 +26,7 @@ Some layers include the corresponding OTel language SDK for the Lambda. This all
 * **What exporters/receivers/processors are included from the OpenTelemetry Collector?**
     > You can check out [the stripped-down collector's imports](https://github.com/open-telemetry/opentelemetry-lambda/blob/main/collector/lambdacomponents/default.go#L18) in this repository for a full list of currently included components.
 * **Is the Lambda layer provided or do I need to build it and distribute it myself?**
-    > This repository does not provide pre-build Lambda layers. They must be built manually and saved in your AWS account. This repo has files to facilitate doing that. More information is provided in [the Collector folder's README](collector/README.md).
+    > This repository provides pre-built Lambda layers, their ARNs are available in the [Releases](https://github.com/open-telemetry/opentelemetry-lambda/releases). You can also build the layers manually and publish them in your AWS account. This repo has files to facilitate doing that. More information is provided in [the Collector folder's README](collector/README.md).
 
 ## Design Proposal