Fix typos

S32-setting-library/IO.pod

@@ -232,7 +232,7 @@ other error in opening, writing, or closing.
 =item chdir
 
     multi sub chdir(Str:D)
-    multi sub chdir(IO::Path::D)
+    multi sub chdir(IO::Path:D)
 
 Changes the current (emulated) working directory to the new value, scoped to the current scope of C<$*CWD> (usually thread-local at worst, or the scope of a C<visitdir> inside the current thread). Fails (X::IO::Chdir) on error.
 If C<$*CWD> is not scoped to the current dynamic scope, you must call C<chdir> again when exiting the
@@ -251,7 +251,7 @@ you to set the working directory as a parameter.
 =item visitdir
 
     multi sub visitdir(Str:D)
-    multi sub visitdir(IO::Path::D)
+    multi sub visitdir(IO::Path:D)
 
 Changes the current (emulated) working directory to the new
 value, scoped to the current dynamic scope just as C<temp $*CWD = newdir();>