s3 : update doc for Glacier storage class

s3 : update doc for Glacier storage class : related to #923

docs/content/s3.md

@@ -217,6 +217,8 @@ Choose a number from below, or type in your own value
    \ "STANDARD_IA"
  5 / One Zone Infrequent Access storage class
    \ "ONEZONE_IA"
+ 6 / Glacier storage class
+   \ "GLACIER"
 storage_class> 1
 Remote config
 --------------------
@@ -386,9 +388,9 @@ A proper fix is being worked on in [issue #1824](https://github.com/ncw/rclone/i
 
 ### Glacier ###
 
-You can transition objects to glacier storage using a [lifecycle policy](http://docs.aws.amazon.com/AmazonS3/latest/user-guide/create-lifecycle.html).
+You can upload objects using the glacier storage class or transition them to glacier using a [lifecycle policy](http://docs.aws.amazon.com/AmazonS3/latest/user-guide/create-lifecycle.html).
 The bucket can still be synced or copied into normally, but if rclone
-tries to access the data you will see an error like below.
+tries to access data from the glacier storage class you will see an error like below.
 
     2017/09/11 19:07:43 Failed to sync: failed to open source object: Object in GLACIER, restore first: path/to/file
 
@@ -852,6 +854,8 @@ The storage class to use when storing new objects in S3.
         - Standard Infrequent Access storage class
     - "ONEZONE_IA"
         - One Zone Infrequent Access storage class
+    - "GLACIER"
+        - GLACIER storage class
 
 ### Advanced Options