[basic.types] Italicize the definitions of 'incompletely-defined object

type' and 'incomplete type', and add index entries.

Author: zygoloid

source/basic.tex

@@ -3493,13 +3493,15 @@
 
 \pnum
 \indextext{type!incomplete}%
+\indextext{type!incompletely-defined object}%
+\indextext{object type!incompletely-defined}%
 A class that has been declared but not defined, an enumeration type in certain
 contexts~(\ref{dcl.enum}), or an array of unknown
-size or of incomplete element type, is an incompletely-defined object
-type.\footnote{The size and layout of an instance of an incompletely-defined
+size or of incomplete element type, is an \defn{incompletely-defined object
+type}.\footnote{The size and layout of an instance of an incompletely-defined
 object type is unknown.}
-Incompletely-defined object types and the void types are incomplete
-types~(\ref{basic.fundamental}). Objects shall not be defined to have an
+Incompletely-defined object types and the void types are \term{incomplete
+types}~(\ref{basic.fundamental}). Objects shall not be defined to have an
 incomplete type.
 
 \pnum