update docs and examples to use shorter config secret syntax

plugins/circleci/README.md

@@ -57,8 +57,7 @@ proxy:
     target: https://circleci.com/api/v1.1
     headers:
       Circle-Token:
-        $secret:
-          env: CIRCLECI_AUTH_TOKEN
+        $env: CIRCLECI_AUTH_TOKEN
 ```
 
 5. Get and provide `CIRCLECI_AUTH_TOKEN` as env variable (https://circleci.com/docs/api/#add-an-api-token)

plugins/jenkins/README.md

@@ -30,8 +30,7 @@ proxy:
     changeOrigin: true
     headers:
       Authorization:
-        $secret:
-          env: JENKINS_BASIC_AUTH_HEADER
+        $env: JENKINS_BASIC_AUTH_HEADER
 ```
 
 4. Add an environment variable which contains the Jenkins credentials, (note: use an API token not your password)

plugins/rollbar-backend/README.md

@@ -10,8 +10,7 @@ The following values are read from the configuration file.
 rollbar:
   organization: spotify
   accountToken:
-    $secret:
-      env: ROLLBAR_ACCOUNT_TOKEN
+    $env: ROLLBAR_ACCOUNT_TOKEN
 ```
 
 _NOTE: The `ROLLBAR_ACCOUNT_TOKEN` environment variable must be set to a read

plugins/rollbar/README.md

@@ -55,8 +55,7 @@ const ServiceEntityPage = ({ entity }: { entity: Entity }) => (
 rollbar:
   organization: spotify
   accountToken:
-    $secret:
-      env: ROLLBAR_ACCOUNT_TOKEN
+    $env: ROLLBAR_ACCOUNT_TOKEN
 ```
 
 7. Annotate entities with the rollbar project slug