docs(eval): fix wrong return type of getcharsearch() (#30176)

(cherry picked from commit 6c2186a998)

runtime/lua/vim/_meta/vimfn.lua

@@ -2823,7 +2823,7 @@ function vim.fn.getcharpos(expr) end
 ---   nnoremap <expr> , getcharsearch().forward ? ',' : ';'
 --- <Also see |setcharsearch()|.
 ---
---- @return table[]
+--- @return table
 function vim.fn.getcharsearch() end
 
 --- Get a single character from the user or input stream as a

src/nvim/eval.lua

@@ -3518,7 +3518,7 @@ M.funcs = {
     ]=],
     name = 'getcharsearch',
     params = {},
-    returns = 'table[]',
+    returns = 'table',
     signature = 'getcharsearch()',
   },
   getcharstr = {