std: fix typo in documentation

alib2std/src/extensions/container/array.hpp

alib2std/src/extensions/container/bitset.hpp

alib2std/src/extensions/container/deque.hpp

alib2std/src/extensions/container/forward_list.hpp

alib2std/src/extensions/container/list.hpp

alib2std/src/extensions/container/map.hpp

alib2std/src/extensions/container/multimap.hpp

alib2std/src/extensions/container/multiset.hpp

alib2std/src/extensions/container/pair.hpp

alib2std/src/extensions/container/set.hpp

alib2std/src/extensions/container/string.hpp

alib2std/src/extensions/container/tuple.hpp

alib2std/src/extensions/container/unordered_map.hpp

alib2std/src/extensions/container/vector.hpp