Fixes a minor typo in the EVP docs.

Out is the buffer which needs to contain at least inl + cipher_block_size - 1 bytes. Outl
is just an int*.
Reviewed-by: NEmilia Käsper <emilia@openssl.org>

doc/crypto/EVP_EncryptInit.pod

@@ -128,7 +128,7 @@ writes the encrypted version to B<out>. This function can be called
 multiple times to encrypt successive blocks of data. The amount
 of data written depends on the block alignment of the encrypted data:
 as a result the amount of data written may be anything from zero bytes
-to (inl + cipher_block_size - 1) so B<outl> should contain sufficient
+to (inl + cipher_block_size - 1) so B<out> should contain sufficient
 room. The actual number of bytes written is placed in B<outl>.
 
 If padding is enabled (the default) then EVP_EncryptFinal_ex() encrypts