Standardise safety comments for virtualizationmanager and vmclient.

Bug: 290018030
Test: m vm virtmgr
Change-Id: Ia3db73b40c8bc9ee12962065d598757df7e21d3a
diff --git a/virtualizationmanager/src/aidl.rs b/virtualizationmanager/src/aidl.rs
index d0a8e85..b2497b1 100644
--- a/virtualizationmanager/src/aidl.rs
+++ b/virtualizationmanager/src/aidl.rs
@@ -1100,8 +1100,9 @@
         Status::new_service_specific_error_str(-1, Some(format!("Failed to create pipe: {:?}", e)))
     })?;
 
-    // SAFETY: We are the sole owners of these fds as they were just created.
+    // SAFETY: We are the sole owner of this FD as we just created it, and it is valid and open.
     let mut reader = BufReader::new(unsafe { File::from_raw_fd(raw_read_fd) });
+    // SAFETY: We are the sole owner of this FD as we just created it, and it is valid and open.
     let write_fd = unsafe { File::from_raw_fd(raw_write_fd) };
 
     std::thread::spawn(move || loop {