docs: lambda layer version may not be 1 (#2430)

Don't hardcode the apm layer version as 1, in 6.24.0 it's 3. While at it fix vars substitution.

Author: xrmx

docs/reference/lambda-support.md

@@ -8,8 +8,9 @@ applies_to:
   product:
     apm_agent_python: ga
 sub:
-  apm-lambda-ext-v: ver-1-5-7
-  apm-python-v: ver-6-23-0
+  apm-lambda-ext-v: ver-1-6-0
+  apm-python-v: ver-6-24-0
+  apm-python-layer-v: 3
 ---
 
 # Monitoring AWS Lambda Python Functions [lambda-support]
@@ -39,14 +40,14 @@ To add the layers to your Lambda function through the AWS Management Console:
 3. Choose the *Specify an ARN* radio button
 4. Copy and paste the following ARNs of the {{apm-lambda-ext}} layer and the APM agent layer in the *Specify an ARN* text input:
     * APM Extension layer:
-      ```
+      ```bash subs=true
       arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-extension-{{apm-lambda-ext-v}}-{ARCHITECTURE}:1 <1>
       ```
       1. Replace `{AWS_REGION}` with the AWS region of your Lambda function and `{ARCHITECTURE}` with its architecture.
 
     * APM agent layer:
-      ```
-      arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:1 <1>
+      ```bash subs=true
+      arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:{{apm-python-layer-v}} <1>
       ```
       1. Replace `{AWS_REGION}` with the AWS region of your Lambda function.
 
@@ -57,10 +58,10 @@ To add the layers to your Lambda function through the AWS Management Console:
 ::::::{tab-item} AWS CLI
 To add the Layer ARNs of the {{apm-lambda-ext}} and the APM agent through the AWS command line interface execute the following command:
 
-```bash
+```bash subs=true
 aws lambda update-function-configuration --function-name yourLambdaFunctionName \
 --layers arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-extension-{{apm-lambda-ext-v}}-{ARCHITECTURE}:1 \ <1>
-arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:1 <2>
+arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:{{apm-python-layer-v}} <2>
 ```
 1. Replace `{AWS_REGION}` with the AWS region of your Lambda function and `{ARCHITECTURE}` with its architecture.
 2. Replace `{AWS_REGION}` with the AWS region of your Lambda function.
@@ -69,7 +70,7 @@ arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v
 ::::::{tab-item} SAM
 In your SAM `template.yml` file add the Layer ARNs of the {{apm-lambda-ext}} and the APM agent as follows:
 
-```yaml
+```yaml subs=true
 ...
 Resources:
   yourLambdaFunction:
@@ -78,7 +79,7 @@ Resources:
       ...
       Layers:
           - arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-extension-{{apm-lambda-ext-v}}-{ARCHITECTURE}:1 <1>
-          - arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:1 <2>
+          - arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:{{apm-python-layer-v}} <2>
 ...
 ```
 1. Replace `{AWS_REGION}` with the AWS region of your Lambda function and `{ARCHITECTURE}` with its architecture.
@@ -88,14 +89,14 @@ Resources:
 ::::::{tab-item} Serverless
 In your `serverless.yml` file add the Layer ARNs of the {{apm-lambda-ext}} and the APM agent to your function as follows:
 
-```yaml
+```yaml subs=true
 ...
 functions:
   yourLambdaFunction:
     handler: ...
     layers:
       - arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-extension-{{apm-lambda-ext-v}}-{ARCHITECTURE}:1 <1>
-      - arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:1 <2>
+      - arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:{{apm-python-layer-v}} <2>
 ...
 ```
 1. Replace `{AWS_REGION}` with the AWS region of your Lambda function and `{ARCHITECTURE}` with its architecture.
@@ -105,11 +106,11 @@ functions:
 ::::::{tab-item} Terraform
 To add the{{apm-lambda-ext}} and the APM agent to your function add the ARNs to the `layers` property in your Terraform file:
 
-```yaml
+```yaml subs=true
 ...
 resource "aws_lambda_function" "your_lambda_function" {
   ...
-  layers = ["arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-extension-{{apm-lambda-ext-v}}-{ARCHITECTURE}:1", "arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:1"] <1>
+  layers = ["arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-extension-{{apm-lambda-ext-v}}-{ARCHITECTURE}:1", "arn:aws:lambda:{AWS_REGION}:267093732750:layer:elastic-apm-python-{{apm-python-v}}:{{apm-python-layer-v}}"] <1>
 }
 ...
 ```