[except.spec] Remove extraneous comma.

Author: Stefanus Du Toit

source/exceptions.tex

@@ -762,7 +762,7 @@
 converted to \tcode{bool} (Clause~\ref{conv}). A \grammarterm{noexcept-specification}
 \tcode{noexcept} is equivalent to \tcode{noexcept(true)}.
 A \tcode{(} token that follows \tcode{noexcept} is part of the
-\grammarterm{noexcept-specification}, and does not commence an
+\grammarterm{noexcept-specification} and does not commence an
 initializer~(\ref{dcl.init}).
 
 \pnum