Provide alias to body function (#350)

Author: mcDevnagh

Diff for: lua/render-markdown/init.lua

@@ -83,6 +83,7 @@ local M = {}
 ---@field public start_col integer
 ---@field public end_col integer
 ---@field public destination string
+---@field public alias? string
 
 ---@class (exact) render.md.UserWikiLink
 ---@field public icon? string

Diff for: lua/render-markdown/render/shortcut.lua

@@ -106,6 +106,7 @@ function Render:wiki_link()
         start_col = self.node.start_col - 1,
         end_col = self.node.end_col + 1,
         destination = sections[1],
+        alias = sections[2],
     }
 
     -- Hide opening & closing outer brackets