Fix typo.

Change-Id: I4303abae61a7526e039ccb9a321b7b18e0ba35b7
Reviewed-on: https://boringssl-review.googlesource.com/4287
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/ec_key.h b/include/openssl/ec_key.h
index d659216..9603952 100644
--- a/include/openssl/ec_key.h
+++ b/include/openssl/ec_key.h
@@ -79,7 +79,7 @@
 #endif
 
 
-/* ec_key.h conatins functions that handle elliptic-curve points that are
+/* ec_key.h contains functions that handle elliptic-curve points that are
  * public/private keys. */