[3.6] completly -> completely (GH-3999) (closes bpo-31788) (#4008)

(cherry picked from commit 1295e11d)

Modules/_ssl.c

@@ -2736,7 +2736,7 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
 #endif
     SSL_CTX_set_options(self->ctx, options);
 
-    /* A bare minimum cipher list without completly broken cipher suites.
+    /* A bare minimum cipher list without completely broken cipher suites.
      * It's far from perfect but gives users a better head start. */
     if (proto_version != PY_SSL_VERSION_SSL2) {
         result = SSL_CTX_set_cipher_list(ctx, "HIGH:!aNULL:!eNULL:!MD5");