[MINOR][R] Reorder Collate fields in DESCRIPTION file

[HyukjinKwon]

What changes were proposed in this pull request?

It seems cran check scripts corrects R/pkg/DESCRIPTION and follows the order in Collate fields.

This PR proposes to fix catalog.R's order so that running this script does not show up a small diff in this file every time.

How was this patch tested?

Manually via ./R/check-cran.sh.

[HyukjinKwon]

@felixcheung, maybe it is not worth being as a separate PR. I am fine if you add this in any of your PR that is going to be merged soon. I just opened this as I just found while playing with SparkR locally.

[SparkQA]

Test build #75509 has finished for PR 17528 at commit 6403514.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[felixcheung]

that's fine I'm at a lost at how it decides the order? The first part is completely unsorted, right?

     'schema.R'
     'generics.R'
     'jobj.R'
     'column.R'
     'group.R'
     'RDD.R'
      'pairRDD.R'
      'DataFrame.R'
      'SQLContext.R'
      'WindowSpec.R'
      'backend.R'

[felixcheung]

merged to master.

[HyukjinKwon]

I just found some references about the order. It seems there was a question about it - http://stackoverflow.com/questions/18544006/how-do-i-indicate-collate-order-in-roxygen2 and https://cran.r-project.org/web/packages/roxygen2/roxygen2.pdf

I didn't run a lot of tests as fortunately It sounds deterministic at least.