Reformat Pull betagroup command desc, remove default command for sync

Author: DechengMa

Sources/AppStoreConnectCLI/Commands/TestFlight/BetaGroups/Sync/PullBetaGroupsCommand.swift

@@ -7,15 +7,15 @@ struct PullBetaGroupsCommand: CommonParsableCommand {
 
     static var configuration = CommandConfiguration(
         commandName: "pull",
-        abstract: "Pull down server beta groups, refresh local beta group config files"
+        abstract: "Pull down existing beta groups, refreshing local beta group config files"
     )
 
     @OptionGroup()
     var common: CommonOptions
 
     @Option(
         default: "./config/betagroups",
-        help: "Path to the Folder containing the information about beta groups. (default: './config/betagroups')"
+        help: "Path to the Folder containing the information about beta groups."
     ) var outputPath: String
 
     func run() throws {

Sources/AppStoreConnectCLI/Commands/TestFlight/BetaGroups/Sync/SyncBetaGroupsCommand.swift

@@ -5,13 +5,10 @@ import ArgumentParser
 struct SyncBetaGroupsCommand: ParsableCommand {
     static var configuration = CommandConfiguration(
         commandName: "sync",
-        abstract: """
-        Sync information about beta groups with provided configuration file.
-        """,
+        abstract: "Sync information about beta groups with provided configuration file.",
         subcommands: [
             PullBetaGroupsCommand.self,
             PushBetaGroupsCommand.self,
-        ],
-        defaultSubcommand: PullBetaGroupsCommand.self
+        ]
     )
 }