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>
