fix(typo): avialable -> available (#14744)

Author: changeworld

quickstarts/microsoft.authorization/rbac-builtinrole-multiplevms/README.md

@@ -42,7 +42,7 @@ DisplayName                    Type                           ObjectId
 -----------                    ----                           --------
 <NAME>                                                        xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 
-**Use following powershell command to learn about RoleDefinitions. Please note, the template already uses appropriate roleDefinition Id. The applicable RoleDefinition names are avialable in the parameter dropdown.
+**Use following powershell command to learn about RoleDefinitions. Please note, the template already uses appropriate roleDefinition Id. The applicable RoleDefinition names are available in the parameter dropdown.
 
 PS C:\> Get-AzureRoleDefinition | fl
 

quickstarts/microsoft.authorization/rbac-builtinrole-virtualmachine/README.md

@@ -38,7 +38,7 @@ DisplayName                    Type                           ObjectId
 -----------                    ----                           --------
 <NAME>                                                        xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 
-**Use following powershell command to learn about RoleDefinitions. Please note, the template already uses appropriate roleDefinition Id. The applicable RoleDefinition names are avialable in the parameter dropdown.
+**Use following powershell command to learn about RoleDefinitions. Please note, the template already uses appropriate roleDefinition Id. The applicable RoleDefinition names are available in the parameter dropdown.
 
 PS C:\> Get-AzureRoleDefinition | fl