deepFreeze recursive function nil ref s/v/value (#1112)

## Changes

The deepFreeze() recursive example function used an invalid `v` local
instead of `value`.

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Author: seanpringle

content/en-us/luau/tables.md

@@ -347,7 +347,7 @@ local function deepFreeze(target)
 	for _, value in target do
 		-- Make sure the value isn't frozen; if it already is, an error will occur
 		if type(value) == "table" and table.isfrozen(value) == false then
-			deepFreeze(v)
+			deepFreeze(value)
 		end
 	end
 end