Add 'GTimeSpec' as 'struct timespec' equivalent

docs/reference/glib/glib-sections.txt

@@ -1319,6 +1319,9 @@ g_time_val_add
 g_time_val_from_iso8601
 g_time_val_to_iso8601
 
+<SUBSECTION>
+GTimeSpec
+
 <SUBSECTION>
 GDate
 GTime

docs/reference/glib/tmpl/date.sgml

@@ -134,6 +134,14 @@ length of the sleep.
 @Returns: 
 
 
+<!-- ##### STRUCT GTimeSpec ##### -->
+<para>
+
+</para>
+
+@tv_sec: 
+@tv_nsec: 
+
 <!-- ##### STRUCT GDate ##### -->
 <para>
 Represents a day between January 1, Year 1 and a few thousand years in