book: “non-linear” should be “non-constant” (changkun#241)

There is no notion of linearity in this book. However, the context makes it clear that non-constant values are meant.
qingchizhibei · Jul 12, 2022 · 4dfd34e · 4dfd34e
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diff --git a/book/en-us/03-runtime.md b/book/en-us/03-runtime.md
@@ -374,7 +374,7 @@ int main() {
 }
 ```
 
-The first question, why not allow non-linear references to bind to non-lvalues?
+The first question, why not allow non-constant references to bind to non-lvalues?
 This is because there is a logic error in this approach:
 
 ```cpp