Expand help strings for github-app-id and github-app-key-file

Author: alexklibisz

docs/help.md

@@ -83,9 +83,9 @@ Options and flags:
     --azure-repos-organization <string>
         The Azure organization (required when --forge-type is azure-repos)
     --github-app-id <integer>
-        GitHub application id
+        GitHub application id. Used to retrieve a list of repos for running scala-steward. This is used instead of repos.md, but git-ask-pass is still required.
     --github-app-key-file <file>
-        GitHub application key file
+        GitHub application key file. Used to retrieve a list of repos for running scala-steward. This is used instead of repos.md, but git-ask-pass is still required.
     --url-checker-test-url <uri>
         URL for testing the UrlChecker at start-up (can be used multiple times); default: https://github.com
     --default-maven-repo <string>

modules/core/src/main/scala/org/scalasteward/core/application/Cli.scala

@@ -284,10 +284,16 @@ object Cli {
     (gitlabMergeWhenPipelineSucceeds, gitlabRequiredReviewers).mapN(GitLabCfg.apply)
 
   private val githubAppId: Opts[Long] =
-    option[Long]("github-app-id", "GitHub application id")
+    option[Long](
+      "github-app-id",
+      "GitHub application id. Used to retrieve a list of repos for running scala-steward. This is used instead of repos.md, but git-ask-pass is still required."
+    )
 
   private val githubAppKeyFile: Opts[File] =
-    option[File]("github-app-key-file", "GitHub application key file")
+    option[File](
+      "github-app-key-file",
+      "GitHub application key file. Used to retrieve a list of repos for running scala-steward. This is used instead of repos.md, but git-ask-pass is still required."
+    )
 
   private val gitHubApp: Opts[Option[GitHubApp]] =
     (githubAppId, githubAppKeyFile).mapN(GitHubApp.apply).orNone