Fix documentation sectioning.

Sections are separated by two blank lines.

Change-Id: If4f94a3b8f96044e83ab116e7603f1654130a551
Reviewed-on: https://boringssl-review.googlesource.com/c/32584
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

include/openssl/ssl.h

@@ -3675,6 +3675,7 @@ OPENSSL_EXPORT void SSL_set_ignore_tls13_downgrade(SSL *ssl, int ignore);
 // mechanism would have aborted |ssl|'s handshake and zero otherwise.
 OPENSSL_EXPORT int SSL_is_tls13_downgrade(const SSL *ssl);
 
+
 // Deprecated functions.
 
 // SSL_library_init calls |CRYPTO_library_init| and returns one.
@@ -3967,7 +3968,6 @@ OPENSSL_EXPORT int SSL_CTX_set1_sigalgs_list(SSL_CTX *ctx, const char *str);
 // more convenient to codesearch for specific algorithm values.
 OPENSSL_EXPORT int SSL_set1_sigalgs_list(SSL *ssl, const char *str);
 
-
 #define SSL_set_app_data(s, arg) (SSL_set_ex_data(s, 0, (char *)(arg)))
 #define SSL_get_app_data(s) (SSL_get_ex_data(s, 0))
 #define SSL_SESSION_set_app_data(s, a) \