Standardise safety comments for virtualizationmanager and vmclient.

Bug: 290018030
Test: m vm virtmgr
Change-Id: Ia3db73b40c8bc9ee12962065d598757df7e21d3a
diff --git a/virtualizationmanager/src/atom.rs b/virtualizationmanager/src/atom.rs
index d6eb141..1d2d191 100644
--- a/virtualizationmanager/src/atom.rs
+++ b/virtualizationmanager/src/atom.rs
@@ -83,7 +83,7 @@
 // This matches how crosvm determines the number of logical cores.
 // For telemetry purposes only.
 pub(crate) fn get_num_cpus() -> Option<usize> {
-    // SAFETY - Only integer constants passed back and forth.
+    // SAFETY: Only integer constants passed back and forth.
     let ret = unsafe { libc::sysconf(libc::_SC_NPROCESSORS_CONF) };
     if ret > 0 {
         ret.try_into().ok()