Link to localrc plugin?

[user202729]

Just a minor thing, maybe it would be useful to link to localrc plugin (or inkarkat's branch of it) in the documentation.

vimtex/doc/vimtex.txt

Line 372 in a630f0f

* https://github.com/embear/vim-localvimrc

It seems the plugin is popular. ( https://superuser.com/a/598970/577463 )