fixup! clarify where a previous pubkey_load happened

Author: jonasnick

src/modules/musig/keyagg_impl.h

@@ -178,8 +178,8 @@ static int secp256k1_musig_pubkey_agg_callback(secp256k1_scalar *sc, secp256k1_g
     secp256k1_musig_pubkey_agg_ecmult_data *ctx = (secp256k1_musig_pubkey_agg_ecmult_data *) data;
     int ret;
     ret = secp256k1_xonly_pubkey_load(ctx->ctx, pt, ctx->pks[idx]);
-    /* pubkey_load can't fail because the same pks have already been loaded (and
-     * we test this) */
+    /* pubkey_load can't fail because the same pks have already been loaded in
+     * `musig_compute_pk_hash` (and we test this). */
     VERIFY_CHECK(ret);
     secp256k1_musig_keyaggcoef_internal(sc, ctx->pk_hash, &pt->x, &ctx->second_pk_x);
     return 1;