make :help link regex non-greedy

doc/nvim-lua-guide.txt

@@ -484,8 +484,8 @@ remote plugins)
 - `vim.treesitter`: module that exposes the functionality of the
 tree-sitter library
 
-This list is by no means comprehensive. If you wish to know more about what's
-made available by the `vim` variable, |lua-stdlib| and |lua-vim| to get a list
+This list is by no means comprehensive. If you wish to know more about
+what's made available by the `vim` variable, |lua-stdlib|` to get a list
 of every module.
 
 Tips~
@@ -992,9 +992,9 @@ See also:
 
 Tips~
 
-Neovim has an extensive library of powerful built-in functions that are very
-useful for plugins. See |vim-function| for an alphabetical list and
-|function-list| for a list of functions grouped by topic.
+Neovim has an extensive library of powerful built-in functions that
+are very useful for plugins. See |vim-function| for a list of functions
+grouped by topic.
 
 Neovim API functions can be used directly through `vim.api.{..}`. See
 |api| for information.

scripts/to_vimdoc.sed

@@ -20,7 +20,7 @@
 
 # Help links
 s/\[`vim\.api\.\(.*\)`\](.*)/|\1|/
-s/\[`:help \(.*\)`\](.*)/|\1|/
+s/\[`:help \([^\[]*\)`\](.*)/|\1|/
 s/\[`\(.*\)`\](.*)/|\1|/
 
 # Markdown links