Improve documentation on hook API

Author: JulianGCalderon

vm/src/vm/runners/cairo_runner.rs

@@ -1093,6 +1093,9 @@ impl CairoRunner {
     /// To make the hints clonable (and cacheable), the hint data type had to
     /// be changed. To avoid breaking the API, new v2 functions were added that
     /// accept the new hint data.
+    ///
+    /// Also, this new function does not call instruction hooks from the
+    /// `test_utils` features, as doing so would imply breaking the hook API.
     pub fn run_until_pc_v2(
         &mut self,
         address: Relocatable,

vm/src/vm/vm_core.rs

@@ -695,6 +695,9 @@ impl VirtualMachine {
     /// [CairoRunner::run_until_pc_v2] for documentation on why the signature
     /// had to be changed.
     ///
+    /// Also, this new function does not call step hooks from the
+    /// `test_utils` features, as doing so would imply breaking the hook API.
+    ///
     /// [CairoRunner::run_until_pc_v2]: crate::vm::runners::cairo_runner::CairoRunner::run_until_pc_v2
     pub fn step_v2(
         &mut self,