Add missing "See also" section to stream reference page

When the "See also" section is missing, the automatically generated links to the other pages within the same subsection are added to a section titled "undefined".

Author: per1234

Language/Functions/Communication/stream.adoc

@@ -58,3 +58,14 @@ link:../stream/streamsettimeout[setTimeout()]
 
 --
 // FUNCTIONS SECTION ENDS
+
+
+// SEE ALSO SECTION
+[#see_also]
+--
+
+[float]
+=== See also
+
+--
+// SEE ALSO SECTION ENDS