Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+% Mutability
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Variables are immutable only by default; we can make them mutable by adding mut in front of the variable name.
+
+```rust
+let mut x = 5;
+println!("The value of x is: {}", x);
+x = 6;
+println!("The value of x is: {}", x);
+```
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[in the current edition: Ch 3.01 — Variables and Mutability][2]**
+* <small>[In the first edition: Ch 3.11 — Mutability][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/mutability.html
+[2]: ch03-01-variables-and-mutability.html