restore the prototype doc for the object constructor, because the

vmodtool doesn't generate them automatically (at least not up to
Varnish 4.1)

src/vmod_blobcode.vcc

@@ -265,6 +265,10 @@ $Object blob(ENUM {IDENTITY, BASE64, BASE64URL, BASE64URLNOPAD, HEX,
                    URL} decoding="IDENTITY",
              STRING_LIST encoded)
 
+Prototype::
+
+	new OBJ = blobcode.blob(ENUM decoding, STRING_LIST encoded)
+
 Creates an object that contains the BLOB derived from the string
 ``encoded`` according to the scheme ``decoding``.