Problem:  no whitespace padding in commentstring option in ftplugins
Solution: Change default to include whitespace padding, update
          existing filetype plugins with the new default value
          (Riley Bruins)

closes: vim/vim#14843

https://github.com/vim/vim/commit/0a0830624a260660c7fa692ecb7e6e5de09114ba

Co-authored-by: Riley Bruins <ribru17@hotmail.com>

Update runtime files

https://github.com/vim/vim/commit/10e8ff9b26078994cae57c2422b145d37aaf714e

Also:
- fix a missing `<` in builtin.txt.
- edit `:function` `{name}` wording to match the change made for the docs above
  by Justin in #10619.
- link to `*vimrc*` rather than `*init.vim*` in repeat.txt change (as `init.lua`
  may also be used).

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Update runtime files
https://github.com/vim/vim/commit/ce001a337e28fa368f40ac6422835d730fb8ebb1

also add `vimStdPlugin` keywords missing from previous updates