[harsh62]

Description

Fixes inconsistencies in the AmplifyCognitoClient docs. No code changes, apart from a doc comment.

• Credentials example. The class doc comment and the README's "Credentials for other AmplifyClients" example
  passed work.credentialsProvider to an AmplifyKinesisClient. Kinesis and Firehose share one offline cache per
  region, so two sessions that each wire one up can send each other's records (README, "Known limitations"). Both
  examples now use AmplifyConnectClient, as the design does for this example, and the README says why Kinesis and
  Firehose need care.
• README "Differences from the Auth plugin" table.
  • Events for autoSignIn() and clearFederationToIdentityPool(): the plugin sends an API Hub event for each, just
    no lifecycle event. The table said "No Hub event".
  • Second sign-in: the rule now covers a session restored with an expiry saved by an earlier launch. The table still
    said "in this process".
• Decision 15 and design §14.8. Both list the hosted-UI sign-out page that can't be shown as .failed. Neither
  said that a sign-out given no window (signOut(options:), signOutStoredSession) shows no page and is .partial
  with hostedUIError, as §4.7 and the README already say.
• Design change log. Limit 6 was restated in an earlier revision with no entry. The new entry records what it used
  to say, and that restoring it is an open question.

General Checklist

• Documentation update
• Commit messages follow the Conventional Commits convention

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.17%. Comparing base (5a9f3f0) to head (056e75f).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4408       +/-   ##
===========================================
+ Coverage   76.04%   88.17%   +12.13%     
===========================================
  Files        1362      487      -875     
  Lines       57864    25405    -32459     
===========================================
- Hits        44003    22401    -21602     
+ Misses      13861     3004    -10857     

Flag	Coverage Δ
API_plugin_unit_test	?
AWSPluginsCore	?
Amplify	?
Amplify_Foundation_Bridge_unit_test	?
Amplify_Foundation_unit_test	?
Amplify_Keychain_unit_test	?
Analytics_plugin_unit_test	?
Auth_plugin_unit_test	84.03% <ø> (+0.03%)	⬆️
CloudWatchClient_unit_test	?
CognitoClient_unit_test	95.58% <ø> (ø)
Connect_unit_test	?
DataStore_plugin_unit_test	?
EventEnrichment_unit_test	?
Firehose_plugin_unit_test	?
Geo_plugin_unit_test	?
Kinesis_plugin_unit_test	?
Logging_plugin_unit_test	?
Predictions_plugin_unit_test	?
PushNotifications_plugin_unit_test	?
RecordCache_unit_test	?
Storage_plugin_unit_test	?
unit_tests	88.17% <ø> (+12.13%)	⬆️

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