Improve the wording of an error message

[alexwlchan]

Previously the following code:

resource "aws_dynamodb_table" "example" {
  name             = "example"
  read_capacity    = 5
  write_capacity   = 5
  hash_key         = "my_id"
  stream_enabled   = true
  stream_view_type = "NOT_A_VALID_STREAM_VIEW_TYPE"

  attribute {
    name = "my_id"
    type = "S"
  }
}

would yield an error message when you ran terraform plan:

* aws_dynamodb_table.bookmarks: "stream_view_type" be a valid DynamoDB StreamViewType

This sentence doesn't make sense – this patch adds the missing "must".

[grubernaut]

LGTM, thanks!

[ghost]

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