[intro.defs] Minor rewording. Avoid sounding like a requirement.

Author: tkoeppe

source/intro.tex

@@ -292,7 +292,7 @@
 \definition{format specifier}{defns.regex.format.specifier}
 \defncontext{regular expression}
 \indexdefn{format specifier}%
-sequence of one or more \termref{defns.character}{character}{s} that is to be
+sequence of one or more \termref{defns.character}{character}{s} that is expected to be
 replaced with some part of a \termref{defns.regex.regular.expression}{regular expression}{} match
 
 \definition{handler function}{defns.handler}
@@ -303,7 +303,7 @@
 \begin{defnote}
 A \Cpp{} program may designate a handler function at various points in its execution by
 supplying a pointer to the function when calling any of the library functions that install
-handler functions\iref{support}.
+handler functions (see \ref{support}).
 \end{defnote}
 
 \indexdefn{program!ill-formed}%