doc: document that the engine initialisation options are deprecated.

They can't be removed yet for API compatibility reasons.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/12226)

doc/man3/OPENSSL_init_crypto.pod

@@ -122,43 +122,51 @@ sub-library (see L<ASYNC_start_job(3)>). This is a default option.
 =item OPENSSL_INIT_ENGINE_RDRAND
 
 With this option the library will automatically load and initialise the
-RDRAND engine (if available). This not a default option.
+RDRAND engine (if available). This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_DYNAMIC
 
 With this option the library will automatically load and initialise the
-dynamic engine. This not a default option.
+dynamic engine. This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_OPENSSL
 
 With this option the library will automatically load and initialise the
-openssl engine. This not a default option.
+openssl engine. This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_CRYPTODEV
 
 With this option the library will automatically load and initialise the
-cryptodev engine (if available). This not a default option.
+cryptodev engine (if available). This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_CAPI
 
 With this option the library will automatically load and initialise the
-CAPI engine (if available). This not a default option.
+CAPI engine (if available). This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_PADLOCK
 
 With this option the library will automatically load and initialise the
-padlock engine (if available). This not a default option.
+padlock engine (if available). This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_AFALG
 
 With this option the library will automatically load and initialise the
-AFALG engine. This not a default option.
+AFALG engine. This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ENGINE_ALL_BUILTIN
 
 With this option the library will automatically load and initialise all the
 built in engines listed above with the exception of the openssl and afalg
-engines. This not a default option.
+engines. This not a default option and is deprecated
+in OpenSSL 3.0.
 
 =item OPENSSL_INIT_ATFORK
 

include/openssl/crypto.h

@@ -434,7 +434,6 @@ int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len);
     | OPENSSL_INIT_ENGINE_CRYPTODEV | OPENSSL_INIT_ENGINE_CAPI | \
     OPENSSL_INIT_ENGINE_PADLOCK)
 
-
 /* Library initialisation functions */
 void OPENSSL_cleanup(void);
 int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings);