docs(eval): fix lnum type for functions using tv_get_lnum

These occurrences also accept string, which is used like in getline.

Also make the lnum field of vim.fn.sign_placelist.list.item optional, as it can
be omitted like vim.fn.sign_place.dict's.

(cherry picked from commit 4a36f234ac)

runtime/lua/vim/_meta/vimfn.lua

@@ -85,7 +85,7 @@ function vim.fn.api_info() end
 ---   let failed = append(0, ["Chapter 1", "the beginning"])
 --- <
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @param text string|string[]
 --- @return 0|1
 function vim.fn.append(lnum, text) end
@@ -907,7 +907,7 @@ function vim.fn.chdir(dir) end
 ---
 --- To get or set indent of lines in a string, see |vim.text.indent()|.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.cindent(lnum) end
 
@@ -1244,7 +1244,7 @@ function vim.fn.ctxset(context, index) end
 --- @return any
 function vim.fn.ctxsize() end
 
---- @param lnum integer
+--- @param lnum integer|string
 --- @param col? integer
 --- @param off? integer
 --- @return any
@@ -1441,7 +1441,7 @@ function vim.fn.did_filetype() end
 --- line, "'m" mark m, etc.
 --- Returns 0 if the current window is not in diff mode.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.diff_filler(lnum) end
 
@@ -1455,7 +1455,7 @@ function vim.fn.diff_filler(lnum) end
 --- The highlight ID can be used with |synIDattr()| to obtain
 --- syntax information about the highlighting.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @param col integer
 --- @return any
 function vim.fn.diff_hlID(lnum, col) end
@@ -2282,7 +2282,7 @@ function vim.fn.fnamemodify(fname, mods) end
 --- {lnum} is used like with |getline()|.  Thus "." is the current
 --- line, "'m" mark m, etc.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.foldclosed(lnum) end
 
@@ -2292,7 +2292,7 @@ function vim.fn.foldclosed(lnum) end
 --- {lnum} is used like with |getline()|.  Thus "." is the current
 --- line, "'m" mark m, etc.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.foldclosedend(lnum) end
 
@@ -2307,7 +2307,7 @@ function vim.fn.foldclosedend(lnum) end
 --- {lnum} is used like with |getline()|.  Thus "." is the current
 --- line, "'m" mark m, etc.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.foldlevel(lnum) end
 
@@ -2338,7 +2338,7 @@ function vim.fn.foldtext() end
 --- line, "'m" mark m, etc.
 --- Useful when exporting folded text, e.g., to HTML.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return string
 function vim.fn.foldtextresult(lnum) end
 
@@ -3284,7 +3284,7 @@ function vim.fn.getjumplist(winnr, tabnr) end
 --- @return string
 function vim.fn.getline(lnum, end_) end
 
---- @param lnum integer
+--- @param lnum integer|string
 --- @param end_ true|number|string|table
 --- @return string|string[]
 function vim.fn.getline(lnum, end_) end
@@ -5170,7 +5170,7 @@ function vim.fn.line(expr, winid) end
 --- |getline()|.  When {lnum} is invalid -1 is returned.
 --- Also see |byte2line()|, |go| and |:goto|.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.line2byte(lnum) end
 
@@ -5180,7 +5180,7 @@ function vim.fn.line2byte(lnum) end
 --- relevant.  {lnum} is used just like in |getline()|.
 --- When {lnum} is invalid, -1 is returned.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.lispindent(lnum) end
 
@@ -6352,7 +6352,7 @@ function vim.fn.msgpackparse(data) end
 --- {lnum} is used like with |getline()|.
 --- See also |prevnonblank()|.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.nextnonblank(lnum) end
 
@@ -6451,7 +6451,7 @@ function vim.fn.pow(x, y) end
 --- {lnum} is used like with |getline()|.
 --- Also see |nextnonblank()|.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @return integer
 function vim.fn.prevnonblank(lnum) end
 
@@ -8060,7 +8060,7 @@ function vim.fn.setcmdline(str, pos) end
 --- @return any
 function vim.fn.setcmdpos(pos) end
 
---- @param lnum integer
+--- @param lnum integer|string
 --- @param col? integer
 --- @param off? integer
 --- @return any
@@ -8139,7 +8139,7 @@ function vim.fn.setfperm(fname, mode) end
 ---
 --- <Note: The '[ and '] marks are not set.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @param text any
 --- @return any
 function vim.fn.setline(lnum, text) end
@@ -9895,7 +9895,7 @@ function vim.fn.swapname(buf) end
 ---   echo synIDattr(synID(line("."), col("."), 1), "name")
 --- <
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @param col integer
 --- @param trans 0|1
 --- @return integer
@@ -9991,7 +9991,7 @@ function vim.fn.synIDtrans(synID) end
 --- since syntax and matching highlighting are two different
 --- mechanisms |syntax-vs-match|.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @param col integer
 --- @return [integer, string, integer]
 function vim.fn.synconcealed(lnum, col) end
@@ -10014,7 +10014,7 @@ function vim.fn.synconcealed(lnum, col) end
 --- character in a line and the first column in an empty line are
 --- valid positions.
 ---
---- @param lnum integer
+--- @param lnum integer|string
 --- @param col integer
 --- @return integer[]
 function vim.fn.synstack(lnum, col) end