docs: Add documentational comments

tools/nvim/lua/keymaps/visual-multi.lua

@@ -1,4 +1,7 @@
+-- Note that this plugin is a fork for colemak
+-- Use mouse to select multiple cursors
 vim.g.VM_mouse_mappings = 1
+-- Disable default mappings
 vim.g.VM_default_mappings = 0
 vim.g.VM_custom_motions = {
   -- https://github.com/mg979/vim-visual-multi/issues/93