chore(grid): move @functions code block to @code (#703)

2019 is now gone :)

Author: marin-bratanov

components/grid/manual-operations.md

@@ -367,7 +367,7 @@ With a few simple loops, you can extract information from the DataSourceRequest
 </TelerikGrid>
 
 
-@functions {
+@code {
     MarkupString ConsoleSim { get; set; } // to showcase what you get
 
     // implementation of OnRead