[DOCS] Duplicative index entries in v10/HEAD builds

In 9.6, the HTML doc build's index entry for "data type" looks like

data type, Data Types   base, The PostgreSQL Type System   category, Overview   composite, The PostgreSQL Type System
constant,Constants of Other Types   conversion, Type Conversion   enumerated (enum), Enumerated Types   internal
organization,Base Types in C-Language Functions   numeric, Numeric Types   type cast, Type Casts   user-defined,
User-definedTypes 

where each of the phrases on the right is a hyperlink to a section.
Fine.  But in HEAD we get

data type, Data Types, Numeric Types, Enumerated Types, Domain Types, Type Conversion, The PostgreSQL Type System, The
PostgreSQLType System, The PostgreSQL Type System, Polymorphic Types, Base Types in C-Language Functions, User-defined
Types  base, The PostgreSQL Type System   category, Overview   composite, The PostgreSQL Type System   constant,
Constantsof Other Types   container, The PostgreSQL Type System   conversion, Type Conversion   domain, Domain Types
enumerated(enum), Enumerated Types   internal organization, Base Types in C-Language Functions   numeric, Numeric Types
 polymorphic, Polymorphic Types   type cast, Type Casts   user-defined, User-defined Types 

How do we get rid of those duplicative (and not-appropriate-to-the-
main-topic) links on the first line?

v10 has the same disease, though not quite as bad as HEAD
because I just added some more <indexterm> items in HEAD.
        regards, tom lane


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