doc: Fixed typo

README.md

@@ -166,7 +166,7 @@ require("markview").setup({
     callbacks = {
         on_enable = function (_, win)
             vim.wo[win].conceallevel = 2;
-            vim.wo[win].conecalcursor = "c";
+            vim.wo[win].concealcursor = "c";
         end
     }
 })