Document the current required toolchain version

In commit 4f71dd5 the default version is bumped to 1.70.0, yet these instructions still carry the old version. Using 1.67.1 fails using the current latest release tag, wherease 1.70.0 succeeds.
tcdi · Jun 23, 2023 · e777ea0 · e777ea0
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diff --git a/doc/book.toml b/doc/book.toml
@@ -6,4 +6,4 @@ src = "src"
 title = "PL/Rust Guide"
 
 [preprocessor.variables.variables]
-toolchain_ver = "1.67.1"
+toolchain_ver = "1.70.0"
diff --git a/doc/src/install-prerequisites.md b/doc/src/install-prerequisites.md
@@ -111,7 +111,7 @@ rustc -V
 The output from `rustc -V` should look similar to the following example.
 
 ```
-rustc {{toolchain_ver}} (d5a82bbd2 2023-02-07)
+rustc {{toolchain_ver}} (90c541806 2023-05-31)
 ```
 
 Use `rustup default` to check that the explicit version of `rustc` is