doc: clarify window-id, tab-id, nvim_set_current_x #32528

Problem:
Descriptions are somewhat vague. nvim_set_current_line modifies contents
but nvim_set_current_buf does not, etc.

Solution:
- Make it clear that these functions accept or return a winid/tabid by
  linking to that concept in help.
- Only these few files use the term "handles", so replace them with the
  more conventional terminology.
- Add a new help section for tab-ID. This concept is unique to neovim
  because vim exposes tabnr, but not tab handles. This section is
  modelled after `:h winid`.

runtime/lua/vim/lsp/util.lua

@@ -1896,7 +1896,7 @@ function M.try_trim_markdown_code_blocks(lines)
   return 'markdown'
 end
 
----@param window integer?: window handle or 0 for current, defaults to current
+---@param window integer?: |window-ID| or 0 for current, defaults to current
 ---@param position_encoding 'utf-8'|'utf-16'|'utf-32'
 local function make_position_param(window, position_encoding)
   window = window or 0
@@ -1915,7 +1915,7 @@ end
 
 --- Creates a `TextDocumentPositionParams` object for the current buffer and cursor position.
 ---
----@param window integer?: window handle or 0 for current, defaults to current
+---@param window integer?: |window-ID| or 0 for current, defaults to current
 ---@param position_encoding 'utf-8'|'utf-16'|'utf-32'
 ---@return lsp.TextDocumentPositionParams
 ---@see https://microsoft.github.io/language-server-protocol/specifications/specification-current/#textDocumentPositionParams
@@ -1974,7 +1974,7 @@ end
 --- `textDocument/codeAction`, `textDocument/colorPresentation`,
 --- `textDocument/rangeFormatting`.
 ---
----@param window integer? window handle or 0 for current, defaults to current
+---@param window integer?: |window-ID| or 0 for current, defaults to current
 ---@param position_encoding "utf-8"|"utf-16"|"utf-32"
 ---@return { textDocument: { uri: lsp.DocumentUri }, range: lsp.Range }
 function M.make_range_params(window, position_encoding)