Add missing newlines and section headers to sha.h

It isn't quite rendering correctly in the documentation generator.

Change-Id: I3b1d0447c6695df08783f301811114b72a047f27
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/79347
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/include/openssl/sha.h b/include/openssl/sha.h
index 8fe7af8..27435e5 100644
--- a/include/openssl/sha.h
+++ b/include/openssl/sha.h
@@ -26,6 +26,8 @@
 // The SHA family of hash functions (SHA-1 and SHA-2).
 
 
+// SHA-1.
+
 // SHA_CBLOCK is the block size of SHA-1.
 #define SHA_CBLOCK 64
 
@@ -139,6 +141,7 @@
                                            const uint8_t *data,
                                            size_t num_blocks);
 
+
 // SHA-384.
 
 // SHA384_CBLOCK is the block size of SHA-384.
@@ -198,6 +201,7 @@
 OPENSSL_EXPORT void SHA512_Transform(SHA512_CTX *sha,
                                      const uint8_t block[SHA512_CBLOCK]);
 
+
 // SHA-512-256
 //
 // See https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf section 5.3.6