update build.extended comments in config.example.toml

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

config.example.toml

@@ -294,9 +294,11 @@ changelog-seen = 2
 
 # Enable a build of the extended Rust tool set which is not only the compiler
 # but also tools such as Cargo. This will also produce "combined installers"
-# which are used to install Rust and Cargo together. This is disabled by
-# default. The `tools` option (immediately below) specifies which tools should
-# be built if `extended = true`.
+# which are used to install Rust and Cargo together.
+# The `tools` (check `config.example.toml` to see its default value) option specifies
+# which tools should be built if `extended = true`.
+#
+# This is disabled by default.
 #extended = false
 
 # Set of tools to be included in the installation.