fix(docs): clean up non-docstring comments for vimdoc gen

These non-docstring comments can be included into doxygen's brief
description and then appear in the succeeding function documentation.

runtime/lua/vim/lsp/util.lua

@@ -1069,7 +1069,7 @@ function M.show_document(location, offset_encoding, opts)
   -- location may be Location or LocationLink
   local range = location.range or location.targetSelectionRange
   if range then
-    --- Jump to new location (adjusting for encoding of characters)
+    -- Jump to new location (adjusting for encoding of characters)
     local row = range.start.line
     local col = get_line_byte_from_position(bufnr, range.start, offset_encoding)
     api.nvim_win_set_cursor(win, { row + 1, col })

runtime/lua/vim/shared.lua

@@ -579,7 +579,7 @@ function vim.tbl_isarray(t)
   local count = 0
 
   for k, _ in pairs(t) do
-    --- Check if the number k is an integer
+    -- Check if the number k is an integer
     if type(k) == 'number' and k == math.floor(k) then
       count = count + 1
     else

runtime/lua/vim/text.lua

@@ -1,4 +1,4 @@
---- Text processing functions.
+-- Text processing functions.
 
 local M = {}