chore: auto-update metadata coverage in METADATA_SUPPORT.md [no ci]

Author: svc-cli-bot

METADATA_SUPPORT.md

@@ -4,7 +4,7 @@ This list compares metadata types found in Salesforce v58 with the [metadata reg
 
 This repository is used by both the Salesforce CLIs and Salesforce's VSCode Extensions.
 
-Currently, there are 516/549 supported metadata types.
+Currently, there are 517/549 supported metadata types.
 For status on any existing gaps, please search or file an issue in the [Salesforce CLI issues only repo](https://github.com/forcedotcom/cli/issues).
 To contribute a new metadata type, please see the [Contributing Metadata Types to the Registry](./contributing/metadata.md)
 
@@ -567,6 +567,8 @@ v59 introduces the following new types.  Here's their current level of support
 
 |Metadata Type|Support|Notes|
 |:---|:---|:---|
+|ConversationChannelDefinition|❌|Not supported, but support could be added|
+|DocumentTemplate|❌|Not supported, but support could be added|
 |FulfillmentStepType|❌|Not supported, but support could be added|
 |ProviderRelationshipMgmtConfig|❌|Not supported, but support could be added|