[dcl.init] Clarify introduction

Fixes #1615.

Author: jensmaurer

source/declarators.tex

@@ -2388,15 +2388,11 @@
 \indextext{initialization|(}
 
 \pnum
-A declarator can specify an initial value for the
-identifier being declared.
-The identifier designates a variable being initialized.
-The process of initialization described in the
-remainder of~\ref{dcl.init}
-applies also to initializations
-specified by other syntactic contexts, such as the initialization
-of function parameters (\ref{expr.call}) or
-the initialization of return values (\ref{stmt.return}).
+The process of initialization described in this subclause applies to
+all initializations regardless of syntactic context, including the
+initialization of a function parameter (\ref{expr.call}), the
+initialization of a return value (\ref{stmt.return}), or when an
+initializer follows a declarator.
 
 \begin{bnf}
 \nontermdef{initializer}\br
@@ -2434,6 +2430,12 @@
     braced-init-list
 \end{bnf}
 
+\begin{note}
+The rules in this subclause apply even if the grammar permits only
+the \grammarterm{brace-or-equal-initializer} form
+of \grammarterm{initializer} in a given context.
+\end{note}
+
 \pnum
 Except for objects declared with the \tcode{constexpr} specifier, for which see~\ref{dcl.constexpr},
 an \grammarterm{initializer} in the definition of a variable can consist of