Fix SHA definitions and their dependencies in library and test suites.

Rework SHA224 and SHA283 documentation.
Define MBEDTLS_SHAxxx_C options in alphabetic order.
Fix SHA224 and SHA384 dependencies in test suites.

Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 2350910..7ed99e0 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -827,7 +827,7 @@
 #if defined(MBEDTLS_SHA256_C)
 #define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE MBEDTLS_MD_SHA256
 #define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN  32
-#elif defined(MBEDTLS_SHA512_C)
+#elif defined(MBEDTLS_SHA384_C)
 #define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE MBEDTLS_MD_SHA384
 #define MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN  48
 #elif defined(MBEDTLS_SHA1_C)