Fix typo in header comments

Change-Id: Ida9c9e08fcbc22ddbe08f7121660ddd3d511e7cc
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/80807
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Auto-Submit: David Benjamin <davidben@google.com>

include/openssl/ssl.h

diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index 982d0d8..6d72829 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -4936,7 +4936,7 @@
   // ClientHelloOuter instead. From there, the handshake will proceed
   // without retry_configs, to signal to the client to disable ECH.
   //
-  // This value may only be returned when |SSL_ech_accepted| returnes one. It
+  // This value may only be returned when |SSL_ech_accepted| returns one. It
   // may be useful if the ClientHelloInner indicated a service which does not
   // support ECH, e.g. if it is a TLS-1.2 only service.
   ssl_select_cert_disable_ech = -2,