Fix the docs for ERR_remove_thread_state and ERR_remove_state

Don't primarly recommend using OPENSSL_thread_stop(), as that's a last
resort.  Instead, recommend leaving it to automatic mechanisms.

Reviewed-by: Matt Caswell <matt@openssl.org>

doc/crypto/ERR_remove_state.pod

diff --git a/doc/crypto/ERR_remove_state.pod b/doc/crypto/ERR_remove_state.pod
index 944365d..a0d2f29 100644
--- a/doc/crypto/ERR_remove_state.pod
+++ b/doc/crypto/ERR_remove_state.pod
@@ -21,8 +21,9 @@
 The functions described here were used to free the error queue
 associated with the current or specificed thread.
 
-They are now deprecated and do nothing, please use
-OPENSSL_thread_stop() instead.
+They are now deprecated and do nothing, as the OpenSSL libraries now
+normally do all thread initialisation and deinitialisation
+automatically (see L<OPENSSL_init_crypto(3)>).
 
 =head1 RETURN VALUE
 
@@ -30,7 +31,7 @@
 
 =head1 SEE ALSO
 
-L<err(3)>, L<OPENSSL_thread_stop(3)>
+L<err(3)>, L<OPENSSL_init_crypto(3)>
 
 =head1 HISTORY