Cleanup index entries around 'alias template'.

Author: jensmaurer

source/declarations.tex

@@ -1386,7 +1386,7 @@
 a deduced class type\iref{dcl.type.class.deduct}.
 The \grammarterm{nested-name-specifier}, if any, shall be non-dependent and
 the \grammarterm{template-name} shall name a deducible template.
-A deducible template is either a class template or
+A \defnadj{deducible}{template} is either a class template or
 an alias template whose \grammarterm{defining-type-id} is of the form
 \begin{ncsimplebnf}
 \opt{\keyword{typename}} \opt{nested-name-specifier} \opt{\keyword{template}} simple-template-id

source/overloading.tex

@@ -1620,6 +1620,7 @@
   the \grammarterm{explicit-specifier} of g (if any).
 \end{itemize}
 
+\indextext{template!deducible arguments of}%
 \pnum
 The arguments of a template \tcode{A} are said to be
 deducible from a type \tcode{T} if, given a class template

source/templates.tex

@@ -3831,7 +3831,7 @@
 \pnum
 A \grammarterm{template-declaration} in which the \grammarterm{declaration} is an
 \grammarterm{alias-declaration}\iref{dcl.dcl} declares the
-\grammarterm{identifier} to be an \defn{alias template}.
+\grammarterm{identifier} to be an \defnadj{alias}{template}.
 An alias template is a name for a family of
 types. The name of the alias template is a \grammarterm{template-name}.