Prevent linebreak between text and parenthesized \refs.

Author: zygoloid

source/basic.tex

@@ -427,7 +427,7 @@
 with external linkage~(\ref{dcl.inline}), inline variable with external
 linkage~(\ref{dcl.inline}), class template
 (Clause~\ref{temp}), non-static function template~(\ref{temp.fct}),
-concept (\ref{temp.concept}),
+concept~(\ref{temp.concept}),
 static data member of a class template~(\ref{temp.static}), member
 function of a class template~(\ref{temp.mem.func}), or template
 specialization for which some template parameters are not

source/intro.tex

@@ -217,7 +217,7 @@
 parameter type list~(\ref{dcl.fct}),
 enclosing namespace (if any),
 and
-\grammarterm{requires-clause} (\ref{temp.constr.decl}) (if any)
+\grammarterm{requires-clause}~(\ref{temp.constr.decl}) (if any)
 \begin{note} Signatures are used as a basis for
 name mangling and linking.\end{note}