Fix some minor POD errors

Stops perldoc complaining about missing encodings and parser confusion.

S17-concurrency.pod

@@ -842,8 +842,6 @@ Produces a C<Supply> that pairs together items from the given and the specified
 supply or supplies, using C<< infix:<,> >> by default or any other
 user-supplied function with the C<with> named parameter.
 
-=back
-
 =item C<zip-latest>
 
   my $z = $s1.zip-latest($s2);                  # like zip, defaults to :with( &[,] )

S28-special-names.pod

@@ -1,3 +1,4 @@
+=encoding utf8
 
 =head1 TITLE
 

S32-setting-library/IO.pod

@@ -575,9 +575,9 @@ All methods (except for C<e>) return the appropriate type object if a path
 has been specified that does not exist.
 
 =over 4
-X<stattimes>
 
 =item accessed
+X<stattimes>
 
 Returns the last access time (C<atime>) of the path, to the degree that it is
 updated on that system.
@@ -1084,11 +1084,14 @@ X<tmpdir>
 Returns a string representation of the first writable directory from a
 list of possible temporary directories.  Returns the current directory
 if no writable temporary directories are found.  The list of directories
-checked depends on the platform; e.g. IO::Spec::Unix checks C<< %*ENV<TMPDIR> >>
+checked depends on the platform; e.g. IO::Spec::Unix checks C<%*ENVE<lt>TMPDIRE<gt>>
 and F</tmp>.
 
     $tmpdir = IO::Spec.tmpdir;
 
+=for comment
+(sorry about the ugly E<> escapes above, Pod::To::* seems to misinterpret it otherwise)
+
 =item no-parent-or-current-test
 
 Returns a test as to whether a given path is identical to the parent or the

S99-glossary.pod

@@ -1,3 +1,5 @@
+=encoding utf8
+
 =head1 TITLE
 
 Synopsis 99: Glossary