doc: Fix ECX FIPS documentation

Both Ed448 and Ed25519 were omitted from the signature list.
X448 and X25519 were flagged as not FIPS valid which wasn't correct.

Fixes #16234

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16239)

doc/man7/OSSL_PROVIDER-FIPS.pod

@@ -116,12 +116,8 @@ The OpenSSL FIPS provider supports these operations and algorithms:
 
 =item X25519, see L<EVP_KEYEXCH-X25519(7)>
 
-This has the property "provider=fips,fips=no"
-
 =item X448, see L<EVP_KEYEXCH-X448(7)>
 
-This has the property "provider=fips,fips=no"
-
 =back
 
 =head2 Asymmetric Signature
@@ -132,6 +128,10 @@ This has the property "provider=fips,fips=no"
 
 =item RSA, see L<EVP_SIGNATURE-RSA(7)>
 
+=item X25519, see L<EVP_SIGNATURE-ED25519(7)>
+
+=item X448, see L<EVP_SIGNATURE-ED448(7)>
+
 =item HMAC, see L<EVP_SIGNATURE-HMAC(7)>
 
 =item CMAC, see L<EVP_SIGNATURE-CMAC(7)>