[F&O] IBM-FO-004: Cross-document references

(IBM-FO-004) Please improve the following cross-document references:

(a) Section 1.2, Function Signatures and Descriptions: Paragraph beginning 
"As is customary" refers to XQuery Section B.1 (Type Promotion). A better 
reference would be XQuery Section 3.1.5 (Function Calls).

(b) Section 1.5.1, xdt:anyAtomic Type: contains a reference to XQuery 
Section 3.12 (Expressions on SequenceTypes). A better reference would be 
to XQuery Section 2.4.3 (SequenceType Syntax). Same comment applies to 
Sections 1.5.2 (xdt:untypedAtomic) and 1.5.3 (xdt:untypedAny).

--Don Chamberlin