[2438] wording fixes

src/lib/dns/python/rrset_collection_python_inc.cc

@@ -79,18 +79,18 @@ RRsetCollection(filename, origin, rrclass)\n\
       origin     (isc.dns.Name) The zone origin.\n\
       rrclass    (isc.dns.RRClass) The zone class.\n\
 \n\
-RRsetCollection(input_stream, origin, rrclass)\n\
+RRsetCollection(input, origin, rrclass)\n\
 \n\
     Constructor.\n\
 \n\
     This constructor is similar to the previous one, but instead of\n\
-    taking a filename to load a zone from, it takes a byte object,\n\
+    taking a filename to load a zone from, it takes a bytes object,\n\
     representing the zone contents in text.\n\
     The constructor throws IscException if there is an error\n\
     during loading.\n\
 \n\
     Parameters:\n\
-      input      (byte) Textual representation of the zone.\n\
+      input      (bytes) Textual representation of the zone.\n\
       origin     (isc.dns.Name) The zone origin.\n\
       rrclass    (isc.dns.RRClass) The zone class.\n\
 \n\