Fix typo in README about authentication classes

Corrected a typo in the README regarding authentication classes.

Author: AnusriGnanaprakasam

README.md

@@ -144,7 +144,7 @@ The information (debug/error) can be obtained by the `AsyncClientClass` that ass
 
 The authentications support by this library covers user, service account (admin) and no authentications.
 
-There are authentication classes that store the sign-in and authentication credentials whuch can be used temporary as it will be duplicated to use later.
+There are authentication classes that store the sign-in and authentication credentials which can be used temporary as it will be duplicated to use later.
 
 The authentication tokens are also supported e.g. custom (signed JWT token), ID and access tokens. The refresh token also supports. User can use third party app/services to create these auth token when sign-in and authentication credentials are sensitive and not allowed to store in the sketch.
 
@@ -725,4 +725,4 @@ Permission is hereby granted, free of charge, to any person obtaining a copy of
 
 `THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.`
 
-*Last updated 2026-01-03 UTC.*
+*Last updated 2026-01-03 UTC.*