Web ant93 release: Updating API version to 2021-01-01 (Azure#14489)

* Adds base for updating Microsoft.Web from version stable/2020-12-01 to version 2021-01-01

* Updates readme

* Updates API version in new specs and examples

* Bring in swagger for Microsoft.CertificateRegistration and Microsoft.… (Azure#14212)

* Bring in swagger for Microsoft.CertificateRegistration and Microsoft.DomainRegistration RPs

* Add custom word

* Actually bring in swagger for Microsoft.CertificateRegistration and Microsoft.DomainRegistration RPs

* Update AppServicePlan.json with preoperty (Azure#14388)

Adding ElasticScaleEnabled to ASP object!

* Swagger changes for kubeenv (Azure#14417)

* Swagger changes for kubeenv

* Add examples for create and update

* Fixing model validations in examples

* Supress systemData for kubeenvironments.json

* Making small change to trigger a re-run of ApiReview runner

* Fixing extendedLocation bug in swagger

* fix model validation

* Carry over missing Acr properties from previous version (Azure#14490)

* [python]Update readme.python.md (Azure#14493)

* Update readme.python.md

* Update readme.md

Co-authored-by: jocawtho <jocawtho@microsoft.com>
Co-authored-by: JennyLawrance <jennylaw@microsoft.com>
Co-authored-by: msyyc <70930885+msyyc@users.noreply.github.com>

custom-words.txt

@@ -781,6 +781,7 @@ groupedby
 GRPC
 GSMT
 GTFS
+guage
 guestconfiguration
 GUID
 GUIDs