Update protocol values in known-issues document (#148)

* Clarify support for new protocol in known issues

Updated issue summary to clarify support for new protocol values in security group rules and network ACL rules.

* Update known-issues.md

Signed-off-by: Astha Jain <astha.jain@ibm.com>

* Update known-issues.md

Signed-off-by: Astha Jain <astha.jain@ibm.com>

---------

Signed-off-by: Astha Jain <astha.jain@ibm.com>

Author: astha-jain

known-issues.md

@@ -1,34 +1,33 @@
 # Known Issues for vpc-go-sdk
 
-## Security Group Rules and Network ACL Rules - discriminator issue
+## Security Group Rules and Network ACL Rules - backward compatibility issue
 #### Publication date - "2025-12-18"
 
-### Patch fix versions available in the following versions - 
-[v0.76.5](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.76.5)
-[v0.75.1](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.75.1)
-[v0.74.2](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.74.2)
-[v0.73.1](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.73.1)
-[v0.72.1](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.72.1)
-[v0.71.2](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.71.2)
-[v0.70.2](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.70.2)
-[v0.69.2](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.69.2)
-[v0.68.1](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.68.1)
-and later versions
-
 ### Affected component
 vpc-go-sdk
 
 ### Affected operations
 Security group rules and Network ACL rules 
 
 ### Issue Summary
-#### Support for `any` Protocol in Security Group Rules and Network ACL Rules
-Security Group rules and Network ACL rules now support the new protocol value `any`. Earlier versions of SDK could result in following error reading a rule with an unsupported protocol value. 
+#### Golang SDK Backward compatibility with new protocols in Network Access Controls and Security Group rules 
+Following the new support for [all IPv4 protocols for ACL and Security Group rules](https://cloud.ibm.com/docs/vpc?topic=vpc-release-notes#vpc-dec1225), earlier versions of the Golang SDK must be updated to avoid the following parsing error when handling rules with the new protocols:
+
 ```
 error unmarshalling vpcv1.SecurityGroupCollection: error unmarshalling property 'security_groups' as []vpcv1.SecurityGroup: error unmarshalling property 'rules' as []vpcv1.SecurityGroupRuleIntf: unrecognized value for discriminator property 'protocol': any
 ```
 
-Fix aligns fallback behavior and error identifiers with the correct model name ( e.g. NetworkACLRule instead of NetworkACLRuleItem).
+The patched SDKs implement the correct fallback behavior and error identifiers with the correct model name (e.g. NetworkACLRule instead of NetworkACLRuleItem).
 
 ### Migration & mitigation
-Migrate to one of the patched versions, or update the SDK to the [latest version](https://github.com/IBM/vpc-go-sdk/releases)
+To mitigate this issue, migrate the `vpc-go-sdk` to the latest version ([v0.78.0](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.78.0)) or any of the patched versions below:
+[v0.77](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.77.0)
+[v0.76](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.76.5)
+[v0.75](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.75.1)
+[v0.74](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.74.2)
+[v0.73](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.73.1)
+[v0.72](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.72.1)
+[v0.71](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.71.2)
+[v0.70](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.70.2)
+[v0.69](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.69.2)
+[v0.68](https://github.com/IBM/vpc-go-sdk/releases/tag/v0.68.1)