docs: misc, help tags for neovim.io searches #31428

Problem:
Various keywords are commonly searched-for on https://neovim.io, but
don't have help tags.

Solution:
Add help tags.

fix #31327

src/nvim/api/vim.c

@@ -1040,7 +1040,7 @@ fail:
 /// Open a terminal instance in a buffer
 ///
 /// By default (and currently the only option) the terminal will not be
-/// connected to an external process. Instead, input send on the channel
+/// connected to an external process. Instead, input sent on the channel
 /// will be echoed directly by the terminal. This is useful to display
 /// ANSI terminal sequences returned as part of a rpc message, or similar.
 ///
@@ -1051,6 +1051,18 @@ fail:
 /// Then |nvim_chan_send()| can be called immediately to process sequences
 /// in a virtual terminal having the intended size.
 ///
+/// Example: this `TermHl` command can be used to display and highlight raw ANSI termcodes, so you
+/// can use Nvim as a "scrollback pager" (for terminals like kitty): [terminal-scrollback-pager]()
+///
+/// ```lua
+/// vim.api.nvim_create_user_command('TermHl', function()
+///   local b = vim.api.nvim_create_buf(false, true)
+///   local chan = vim.api.nvim_open_term(b, {})
+///   vim.api.nvim_chan_send(chan, table.concat(vim.api.nvim_buf_get_lines(0, 0, -1, false), '\n'))
+///   vim.api.nvim_win_set_buf(0, b)
+/// end, { desc = 'Highlights ANSI termcodes in curbuf' })
+/// ```
+///
 /// @param buffer the buffer to use (expected to be empty)
 /// @param opts   Optional parameters.
 ///          - on_input: Lua callback for input sent, i e keypresses in terminal

src/nvim/eval.lua

@@ -6049,6 +6049,7 @@ M.funcs = {
     ]=],
     name = 'jobwait',
     params = { { 'jobs', 'integer[]' }, { 'timeout', 'integer' } },
+    returns = 'integer[]',
     signature = 'jobwait({jobs} [, {timeout}])',
   },
   join = {
@@ -8776,7 +8777,7 @@ M.funcs = {
       <
     ]=],
     name = 'rpcnotify',
-    params = { { 'channel', 'integer' }, { 'event', 'string' }, { 'args', 'any' } },
+    params = { { 'channel', 'integer' }, { 'event', 'string' }, { '...', 'any' } },
     signature = 'rpcnotify({channel}, {event} [, {args}...])',
   },
   rpcrequest = {
@@ -8789,7 +8790,7 @@ M.funcs = {
       <
     ]=],
     name = 'rpcrequest',
-    params = { { 'channel', 'integer' }, { 'method', 'string' }, { 'args', 'any' } },
+    params = { { 'channel', 'integer' }, { 'method', 'string' }, { '...', 'any' } },
     signature = 'rpcrequest({channel}, {method} [, {args}...])',
   },
   rpcstart = {
@@ -11155,7 +11156,7 @@ M.funcs = {
       and exists only for backwards-compatibility.
       With UTF-8 composing characters are handled properly: >vim
       	echo str2list("á")		" returns [97, 769]
-
+      <
     ]=],
     name = 'str2list',
     params = { { 'string', 'string' }, { 'utf8', 'boolean' } },
@@ -13091,6 +13092,7 @@ M.funcs = {
     ]=],
     name = 'winlayout',
     params = { { 'tabnr', 'integer' } },
+    returns = 'any[]',
     signature = 'winlayout([{tabnr}])',
   },
   winline = {