Fix typo.

doc/Type/IO/Handle.pod6

@@ -1033,7 +1033,7 @@ In this example we are creating a simple C<WRITE> redirection which stores
 anything written to the filehandle to an array. Se need to save the standard
 output first, which we do in C<$output>, and then everything that is C<print>ed
 or said (through C<say>) gets stored in the defined C<IO::Store> class. Two
-things shoule be taken into account in this class. By default, C<IO::Handle>s
+things should be taken into account in this class. By default, C<IO::Handle>s
 are in binary mode, so we need to C<TWEAK> the objects if we want them to work
 with text. Second, a C<WRITE> operation should return C<True> if successful. It
 will fail if it does not.