Various tweaks -- add our sections, etc.

@@ -335,10 +335,14 @@
         "EXIT STATUS",
         "EXAMPLES",
         "DIAGNOSTICS",
         "COMPATIBILITY",
         "ERRORS",
+        "ARCHITECTURE",
+        "CODE SET INDEPENDENCE",
+        "INTERFACE STABILITY",
+        "MULTITHREADING LEVEL",
         "SEE ALSO",
         "STANDARDS",
         "HISTORY",
         "AUTHORS",
         "CAVEATS",