man/sd_notify: fix indentation in sample programs

Whether we use a newline at the beginning of <programlisting> or not doesn't
seem to have any effect. So let's use the newline in multi-line examples; it is
easier to get the indentation right this way.

man/sd_notify.xml

@@ -436,10 +436,11 @@
       <para>A service could send the following after completing
       initialization:</para>
 
-      <programlisting>sd_notifyf(0, "READY=1\n"
-        "STATUS=Processing requests…\n"
-        "MAINPID=%lu",
-        (unsigned long) getpid());</programlisting>
+      <programlisting>
+sd_notifyf(0, "READY=1\n"
+           "STATUS=Processing requests…\n"
+           "MAINPID=%lu",
+           (unsigned long) getpid());</programlisting>
     </example>
 
     <example>
@@ -447,10 +448,11 @@
 
       <para>A service could send the following shortly before exiting, on failure:</para>
 
-      <programlisting>sd_notifyf(0, "STATUS=Failed to start up: %s\n"
-        "ERRNO=%i",
-        strerror_r(errnum, (char[1024]){}, 1024),
-        errnum);</programlisting>
+      <programlisting>
+sd_notifyf(0, "STATUS=Failed to start up: %s\n"
+           "ERRNO=%i",
+           strerror_r(errnum, (char[1024]){}, 1024),
+           errnum);</programlisting>
     </example>
 
     <example>
@@ -473,9 +475,10 @@
       to synchronize against reception of all notifications sent before
       this call is made.</para>
 
-      <programlisting>sd_notify(0, "READY=1");
-      /* set timeout to 5 seconds */
-      sd_notify_barrier(0, 5 * 1000000);
+      <programlisting>
+sd_notify(0, "READY=1");
+/* set timeout to 5 seconds */
+sd_notify_barrier(0, 5 * 1000000);
       </programlisting>
     </example>
   </refsect1>