String interpolation now implies tostring

Author: Sainan

docs/New Features/String Interpolation.md

@@ -1,18 +1,18 @@
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-String interpolation is a simple alternative syntax to concatenation.
+String interpolation is a simple alternative syntax to concatenation that also implies `tostring`.
 
 ```pluto title="Concatenation"
-local label = "meaning of life"
-local data = { value = 42 }
-print("The " .. label .. " is " .. data.value) --> The meaning of life is 42
+local label = { en = "meaning of life" }
+local data = nil
+print("The " .. label.en .. " is " .. tostring(data)) --> The meaning of life is nil
 ```
 
 ```pluto title="String Interpolation"
-local label = "meaning of life"
-local data = { value = 42 }
-print($"The {label} is {data.value}") --> The meaning of life is 42
+local label = { en = "meaning of life" }
+local data = nil
+print($"The {label.en} is {data}") --> The meaning of life is nil
 ```
 
-As you can see, you declare a string interpolated by prefixing it with the "$" symbol. Brackets can contain any expression. The result of expressions will be converted to a string as with normal concatenation, although note that Pluto supports [boolean concatenation](../QoL%20Improvements/Boolean%20Concatenation) unlike Lua.
+As you can see, you declare a string interpolated by prefixing it with the "$" symbol. Brackets can contain any expression. The result of expressions will be passed to `tostring`.