Standardise safety comments for virtualizationmanager and vmclient.

Bug: 290018030
Test: m vm virtmgr
Change-Id: Ia3db73b40c8bc9ee12962065d598757df7e21d3a
diff --git a/vmclient/src/lib.rs b/vmclient/src/lib.rs
index cfd015a..7c0383b 100644
--- a/vmclient/src/lib.rs
+++ b/vmclient/src/lib.rs
@@ -67,7 +67,7 @@
     // file descriptors (expected by SharedChild).
     let (raw1, raw2) = pipe2(OFlag::O_CLOEXEC)?;
 
-    // SAFETY - Taking ownership of brand new FDs.
+    // SAFETY: Taking ownership of brand new FDs.
     unsafe { Ok((OwnedFd::from_raw_fd(raw1), OwnedFd::from_raw_fd(raw2))) }
 }
 
@@ -80,7 +80,7 @@
     let (raw1, raw2) =
         socketpair(AddressFamily::Unix, SockType::Stream, None, SockFlag::SOCK_CLOEXEC)?;
 
-    // SAFETY - Taking ownership of brand new FDs.
+    // SAFETY: Taking ownership of brand new FDs.
     unsafe { Ok((OwnedFd::from_raw_fd(raw1), OwnedFd::from_raw_fd(raw2))) }
 }