fixups: fixed missing edit to init-declarator grammar

Author: notadragon

source/declarations.tex

@@ -2296,7 +2296,7 @@
 
 \begin{bnf}
 \nontermdef{init-declarator}\br
-    declarator \opt{initializer}\br
+    declarator initializer\br
     declarator \opt{requires-clause} \opt{function-contract-specifier-seq}
 \end{bnf}