#11 offset within composite

Offset attribute applies to a simple type, enum or bitset within a composite type.

Author: donmendelson

v1-0-RC4/doc/04MessageSchema.md

@@ -208,7 +208,7 @@ constant exponent, which is not sent on the wire.
 
 If a message designer wishes to control byte boundary alignment or map
 to an existing data structure, element offset may optionally be
-specified on simple types within a composite type. Offset is the number
+specified on a simple type, enum or bitset within a composite type. Offset is the number
 of octets from the start of the composite; it is a zero-based index.
 
 If specified, offset must be greater than or equal to the sum of the
@@ -558,4 +558,4 @@ Reserved element names
 | unit           | timestamp, TZ time          |
 | version        | messageHeader               |
 | week           | MonthYear                   |
-| year           | MonthYear                   |
+| year           | MonthYear                   |