Spellcheck our public headers.

Also fix some formatting.

Change-Id: I8fb1a95d4a55e40127433f0114fd08a82a4c3d41
Reviewed-on: https://boringssl-review.googlesource.com/13103
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/cipher.h b/include/openssl/cipher.h
index a8585d7..2ee74ef 100644
--- a/include/openssl/cipher.h
+++ b/include/openssl/cipher.h
@@ -191,7 +191,7 @@
  * |*out_len| to the number of bytes written. If padding is enabled (the
  * default) then padding is removed from the final block.
  *
- * WARNING: it is unsafe to call this function with unauthenticted
+ * WARNING: it is unsafe to call this function with unauthenticated
  * ciphertext if padding is enabled. */
 OPENSSL_EXPORT int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out,
                                        int *out_len);
@@ -282,12 +282,13 @@
 /* EVP_CIPHER_CTX_set_key_length sets the key length for |ctx|. This is only
  * valid for ciphers that can take a variable length key. It returns one on
  * success and zero on error. */
-OPENSSL_EXPORT int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *ctx, unsigned key_len);
+OPENSSL_EXPORT int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *ctx,
+                                                 unsigned key_len);
 
 
 /* Cipher accessors. */
 
-/* EVP_CIPHER_nid returns a NID identifing |cipher|. (For example,
+/* EVP_CIPHER_nid returns a NID identifying |cipher|. (For example,
  * |NID_aes_128_gcm|.) */
 OPENSSL_EXPORT int EVP_CIPHER_nid(const EVP_CIPHER *cipher);