[hive.operations] Fix singular/plural mismatch (#8621)

Author: Andreas-Krug

source/containers.tex

@@ -8835,7 +8835,7 @@
 \effects
 If \tcode{addressof(x) == this} is \tcode{true},
 the behavior is erroneous and there are no effects.
-If an exceptions is thrown,
+If an exception is thrown,
 there are no effects.
 Otherwise, inserts the contents of \tcode{x} into \tcode{*this} and
 \tcode{x} becomes empty.