[TASK] Update composer usage for fetching custom CMS version

Change-Id: I46dd10e63951f8dbb3f31568d878ca1b86983474

index.md

@@ -31,11 +31,15 @@ How to use it?
 As a quick way to use Composer, the Base Distribution can be downloaded. It is assuming you have Composer already [installed][2]
 on your system:
 
-	# Download the Base Distribution, the "stable" branch (6.2)
+	# Download the Base Distribution, the latest "stable" release (6.2)
 	composer create-project typo3/cms-base-distribution CmsBaseDistribution
 
 	# Download the Base Distribution, the "dev" branch (7.x)
-	composer create-project typo3/cms-base-distribution --stability dev CmsBaseDistribution
+	composer create-project typo3/cms-base-distribution CmsBaseDistribution dev-master
+
+	# Download the Base Distribution, the "dev" 6.2 branch
+	composer create-project typo3/cms-base-distribution CmsBaseDistribution 6.2.x-dev
+
 
 As a second step, we are going to add additional packages. The commands must be run from inside the ``CmsBaseDistribution`` directory.