Update endpoint example for azure openai. (Azure#21522)

* Update endpoint example for azure openai.

* adding custom word for spellchecker

Author: bexxx

custom-words.txt

@@ -83,6 +83,7 @@ anomalyfinder
 Antimalware
 antimeridian
 antispam
+aoairesource
 APAC
 APACHEAVRO
 apim

specification/cognitiveservices/data-plane/AzureOpenAI/authoring/preview/2022-03-01-preview/azureopenai.json

@@ -1698,7 +1698,7 @@
     "endpoint": {
       "in": "path",
       "name": "endpoint",
-      "description": "Supported Cognitive Services endpoints (protocol and hostname, for example: https://westus.api.cognitive.microsoft.com).",
+      "description": "Supported Cognitive Services endpoints (protocol and hostname, for example: https://aoairesource.openai.azure.com. Replace \"aoairesource\" with your Azure OpenAI account name).",
       "required": true,
       "type": "string",
       "format": "uri",

specification/cognitiveservices/data-plane/AzureOpenAI/authoring/preview/2022-06-01-preview/azureopenai.json

@@ -1761,7 +1761,7 @@
     "endpoint": {
       "in": "path",
       "name": "endpoint",
-      "description": "Supported Cognitive Services endpoints (protocol and hostname, for example: https://westus.api.cognitive.microsoft.com).",
+      "description": "Supported Cognitive Services endpoints (protocol and hostname, for example: https://aoairesource.openai.azure.com. Replace \"aoairesource\" with your Azure OpenAI account name).",
       "required": true,
       "type": "string",
       "format": "uri",