runtime(r,rhelp,rmd,rnoweb,rrst): Update ftplugin, browsefilter labels (#14126)

Use the standard format for browsefilter labels:
  "File Description (*.ext1, *.ext2, *.ext3)"

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/r.vim b/runtime/ftplugin/r.vim
index b3ffc91..6b07744 100644
--- a/runtime/ftplugin/r.vim
+++ b/runtime/ftplugin/r.vim
@@ -1,11 +1,9 @@
 " Vim filetype plugin file
-" Language: R
-" Maintainer: This runtime file is looking for a new maintainer.
-" Former Maintainer: Jakson Alves de Aquino <jalvesaq@gmail.com>
-" Former Repository: https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	2022 Apr 24  09:14AM
-"		2024 Jan 14 by Vim Project (browsefilter)
-"		2024 Feb 19 by Vim Project (announce adoption)
+" Language:		R
+" Maintainer:		This runtime file is looking for a new maintainer.
+" Former Maintainer:	Jakson Alves de Aquino <jalvesaq@gmail.com>
+" Former Repository:	https://github.com/jalvesaq/R-Vim-runtime
+" Last Change:		2024 Feb 28 by Vim Project
 
 " Only do this when not yet done for this buffer
 if exists("b:did_ftplugin")
@@ -25,7 +23,7 @@
 
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
   let b:browsefilter = "R Source Files (*.R)\t*.R\n" .
-        \ "Files that include R (*.Rnw *.Rd *.Rmd *.Rrst *.qmd)\t*.Rnw;*.Rd;*.Rmd;*.Rrst;*.qmd\n"
+        \ "Files that include R (*.Rnw, *.Rd, *.Rmd, *.Rrst, *.qmd)\t*.Rnw;*.Rd;*.Rmd;*.Rrst;*.qmd\n"
   if has("win32")
     let b:browsefilter .= "All Files (*.*)\t*\n"
   else