Fix spelling mistakes

These were found with:
codespell -w $(git ls-files | grep "\.[hc]\(pp\)\?$")

At some point in the future, we might want to get this enabled in CI.

Change-Id: Iccb57b2adfd06a2e177e99db2923fe4e8e329118
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/include/dbus_singleton.hpp b/include/dbus_singleton.hpp
index 67f57b7..2448636 100644
--- a/include/dbus_singleton.hpp
+++ b/include/dbus_singleton.hpp
@@ -6,8 +6,8 @@
 namespace connections
 {
 
-// Initialze before using!
-// Please see webserver_main for the example how this variable is initialzed,
+// Initialize before using!
+// Please see webserver_main for the example how this variable is initialized,
 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
 extern sdbusplus::asio::connection* systemBus;