clarify log message and fix spelling

Author: bodewig

Diff for: lib/resty/openidc.lua

@@ -1127,7 +1127,7 @@ local function openidc_access_token(opts, session, try_to_renew)
     if store_in_session(opts, 'id_token') then
       local id_token, err = openidc_load_and_validate_jwt_id_token(opts, json.id_token, session)
       if err then
-        ngx.log(ngx.ERR, "invalid id token, discaring refreshed id token")
+        ngx.log(ngx.ERR, "invalid id token, discarding tokens returned while refreshing")
         session.data.access_token = nil
         session.data.access_token_expiration = nil
         session.data.refresh_token = nil

Diff for: tests/spec/token_refresh_spec.lua

@@ -197,8 +197,8 @@ describe("if refresh contains an invalid id_token", function()
   it ("the id token gets refreshed", function()
     assert.error_log_contains("id_token refreshed")
   end)
-  it("the id token is rejected", function()
-    assert.error_log_contains("invalid id token, discaring refreshed id token")
+  it("the tokens are rejected", function()
+    assert.error_log_contains("invalid id token, discarding tokens returned while refreshing")
   end)
   it("the access token is discarded", function()
     assert.error_log_contains("lost access token")