[namespace.alias] Remove trailing "\br" in grammar

Author: eisenwave

source/declarations.tex

@@ -8431,7 +8431,7 @@
 \begin{bnf}
 \nontermdef{namespace-alias-definition}\br
         \keyword{namespace} identifier \terminal{=} qualified-namespace-specifier \terminal{;}\br
-        \keyword{namespace} identifier \terminal{=} splice-specifier \terminal{;}\br
+        \keyword{namespace} identifier \terminal{=} splice-specifier \terminal{;}
 \end{bnf}
 
 \begin{bnf}