nvim: keymappings: Add a key mapping to help with opening vim docs

nvim/.config/nvim/lua/keymappings.lua

@@ -98,6 +98,7 @@ remap('n', '<C-\\>', ':vsp <CR>:<C-u>tag <C-r><C-w><CR>', { noremap = true })
 remap('n', '<A-]>',  ':sp <CR>:<C-u>tag <C-r><C-w><CR>',  { noremap = true })
 
 remap('n', '<Leader>n', ':nohlsearch<CR>', { noremap = true, silent = true })
+remap('n', '<Leader>h', ':help<SPACE>',    { noremap = true })
 
 -- Move across wrapped lines like regular lines
 -- Go to the first non-blank character of a line