User/wmbt96/azsadmin apiconsistency features quotas (#13559)

* Adding API spec for 2021-01-01 Quotas for GPU VMs

* Adding API spec for 2020-11-01 Features

* Fixing path parameter 'location'

* Fixing 'locationName' in Quotas spec

* Fixing 'location' in Features

* Fixing Features oav validate-spec errors

* Updating readme.md and fixing validator warnings

* Fixing 'locationName' in Quota examples

* Added missing newline at end of files

* Adding ddagpu to custom words

* Fixing Enum Mismatch

* Fixing ModelValidation Errors

* Fixing LintDiff by adding default error responses

* Fixed 'partitionedGpuCount' in Create example

* Amending default error schema

* Adhering to default error response schema

* Adding 2020-11-01 Features to stable folder and updating readme

* Copying Compute.json and updating Features' references

* Moving Quotas 2021-01-01 to stable and making copy of Compute.json

* Updating readme with stable paths

* Adding references to Compute.json copies in readme

* Using single Compute.json copy

* Adding param & definition references within specs

Co-authored-by: Miguel Concha Vazquez <miconcha@microsoft.com>

custom-words.txt

@@ -476,6 +476,7 @@ datetimeoffset
 datetimes
 DBFS
 DCOS
+ddagpu
 Ddos
 DDTHH
 deadletter