[tuple.assign] Remove incorrect comma at end (#7609)

Author: Andreas-Krug

source/utilities.tex

@@ -2440,7 +2440,7 @@
 
 \item
 \tcode{sizeof...(Types)}
-equals \tcode{tuple_size_v<remove_cvref_t<UTuple>>}, and,
+equals \tcode{tuple_size_v<remove_cvref_t<UTuple>>}, and
 
 \item
 \tcode{is_assignable_v<$\tcode{T}_i$\&, decltype(get<$i$>(std::forward<UTuple>(u)))>}
@@ -2477,7 +2477,7 @@
 
 \item
 \tcode{sizeof...(Types)}
-equals \tcode{tuple_size_v<remove_cvref_t<UTuple>>}, and,
+equals \tcode{tuple_size_v<remove_cvref_t<UTuple>>}, and
 
 \item
 \tcode{is_assignable_v<const $\tcode{T}_i$\&, decltype(get<$i$>(std::forward<UTuple>(u)))>}