fix typos

Author: coke

doc/Type/IO/Handle.pod6

@@ -477,7 +477,7 @@ Defined as:
     method flush(IO::Handle:D: --> True);
 
 Will flush the handle, writing any of the buffered data. Returns C<True>
-on succes; otherwise, L<fails|/routine/fail> with C<X::IO::Flush>.
+on success; otherwise, L<fails|/routine/fail> with C<X::IO::Flush>.
 
 =begin code :skip-test
     with "foo".IO.open: :w {

doc/Type/IO/Spec/Unix.pod6

@@ -142,7 +142,7 @@ B<NOTE:> Most users would want to use the higher-level routine
 L«C<IO::Path.extension>|/type/IO::Path#method_extension» instead of this
 lower-level version.
 
-Defained as:
+Defined as:
 
     method extension(Str:D $path --> Str:D);