all: fix minor typos

[thaller@redhat.com: original patch by Yuri, extracted from [1]]

[1] https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/565

src/basic/process-util.c

@@ -1334,7 +1334,7 @@ int safe_fork_full(
 
                 ppid = getppid();
                 if (ppid == 0)
-                        /* Parent is in a differn't PID namespace. */;
+                        /* Parent is in a different PID namespace. */;
                 else if (ppid != original_pid) {
                         log_debug("Parent died early, raising SIGTERM.");
                         (void) raise(SIGTERM);