Make references more precise.

Author: Eelis

source/statements.tex

@@ -1092,7 +1092,7 @@
 of many examples.
 \begin{example}
 Assuming \tcode{T} is a
-\grammarterm{simple-type-specifier}\iref{dcl.type},
+\grammarterm{simple-type-specifier}\iref{dcl.type.simple},
 
 \begin{codeblock}
 T(a)->m = 7;        // expression-statement

source/strings.tex

@@ -2728,7 +2728,7 @@
 \begin{itemdescr}
 \pnum
 \effects
-Move assigns as a sequence container\iref{container.requirements},
+Move assigns as a sequence container\iref{sequence.reqmts},
 except that iterators, pointers and references may be invalidated.
 
 \pnum