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/rmd.vim b/runtime/ftplugin/rmd.vim
index 74b920f..a537017 100644
--- a/runtime/ftplugin/rmd.vim
+++ b/runtime/ftplugin/rmd.vim
@@ -1,9 +1,9 @@
 " Vim filetype plugin file
-" Language: R Markdown file
-" Maintainer: Jakson Alves de Aquino <jalvesaq@gmail.com>
-" Homepage: https://github.com/jalvesaq/R-Vim-runtime
-" Last Change:	2023 May 29  06:31AM
-"		2024 Jan 14 by Vim Project (browsefilter)
+" Language:		R Markdown file
+" 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
 " Original work by Alex Zvoleff (adjusted from R help for rmd by Michel Kuhlmann)
 
 " Only do this when not yet done for this buffer
@@ -65,7 +65,7 @@
 let b:did_ftplugin = 1
 
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
-  let b:browsefilter = "R Source Files (*.R *.Rnw *.Rd *.Rmd *.Rrst *.qmd)\t*.R;*.Rnw;*.Rd;*.Rmd;*.Rrst;*.qmd\n"
+  let b:browsefilter = "R Source Files (*.R, *.Rnw, *.Rd, *.Rmd, *.Rrst, *.qmd)\t*.R;*.Rnw;*.Rd;*.Rmd;*.Rrst;*.qmd\n"
   if has("win32")
     let b:browsefilter .= "All Files (*.*)\t*\n"
   else