Fix description of public IP address name (#10070)

Author: dennis-benzinger-hybris

specification/network/resource-manager/Microsoft.Network/stable/2020-05-01/publicIpAddress.json

@@ -54,7 +54,7 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The name of the subnet."
+            "description": "The name of the public IP address."
           },
           {
             "$ref": "./network.json#/parameters/ApiVersionParameter"
@@ -109,7 +109,7 @@
             "in": "path",
             "required": true,
             "type": "string",
-            "description": "The name of the subnet."
+            "description": "The name of the public IP address."
           },
           {
             "$ref": "./network.json#/parameters/ApiVersionParameter"