CFE-757: Update changes made during Azure user tags implementation

enhancements/api-review/azure_user_defined_tags.md

@@ -75,8 +75,8 @@ tags meet all the below conditions or else the cluster creation will fail.
     - Tag name has a limit of 512 characters for all resources except for 
     storage accounts, which has a limit of 128 characters and hence tag name 
     length is restricted to 128 characters on every resource required by Openshift.
-2. A tag name cannot contain `<, >, %, &, \, ?, /, #, :, whitespace` characters and 
-   must not start with a number.
+2. A tag name must begin with a letter, end with a letter, number or underscore, and
+   can contain only letters, numbers, underscores, periods, or hyphens.
     - DNS zones, Traffic, Front Door resources does not support tag with spaces, 
     special/unicode characters or starting with number, hence these are added as 
     constraints on every other Azure resource required by Openshift as well.
@@ -161,12 +161,12 @@ spec:
                     properties:
                       resourceTags:
                         description: resourceTags is a list of additional tags to apply to Azure
-                        resources created for the cluster. See 
-                        https://docs.microsoft.com/en-us/rest/api/resources/tags for information 
-                        on tagging Azure resources. Azure supports a maximum of 50 tags per 
-                        resource except for few, which have limitation of 15 tags. OpenShift 
-                        reserves 5 tags for its internal use, and allows 10 tags 
-                        for user configuration.
+                        resources created for the cluster. See
+                        https://docs.microsoft.com/en-us/rest/api/resources/tags for information
+                        on tagging Azure resources. Due to limitations on Automation,
+                        Content Delivery Network, DNS Azure resources, a maximum of 15 tags may be
+                        applied. OpenShift reserves 5 tags for internal use, allowing 10 tags for
+                        user configuration.
                         type: array
                         maxItems: 10
                         items:
@@ -177,13 +177,17 @@ spec:
                             - value
                           properties:
                             key:
-                              description: key is the key of the tag
-                              type: string
+                              description: key is the key part of the tag. A tag key can have a maximum of
+                              128 characters and cannot be empty. Key must begin with a letter, end with a
+                              letter, number or underscore, and must contain only alphanumeric characters
+                              and the following special characters `_ . -`.
                               maxLength: 128
                               minLength: 1
-                              pattern: ^[a-zA-Z][0-9A-Za-z_.=+-@]+$
+                              pattern: ^[a-zA-Z]([0-9A-Za-z_.-]*[0-9A-Za-z_])?$
                             value:
-                              description: value is the value of the tag.
+                              description: value is the value part of the tag. A tag value can have a maximum
+                              of 256 characters and cannot be empty. Value must contain only alphanumeric
+                              characters and the following special characters `_ + , - . / : ; < = > ? @`.
                               type: string
                               maxLength: 256
                               minLength: 1