rustbuild: add verbose to config.toml.example

Signed-off-by: Marc-Antoine Perennou <[email protected]>

Author: Keruspe

src/bootstrap/config.toml.example

@@ -124,6 +124,9 @@
 # disabled by default.
 #extended = false
 
+# Verbosity level: 0 == not verbose, 1 == verbose, 2 == very verbose
+#verbose = 0
+
 # =============================================================================
 # General install configuration options
 # =============================================================================