Create troubleshooting doc on versioning_operation_template_changes.md (

Azure#847)

docs/troubleshoot/versioning_operation_template_changes.md

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+# How can I change the operation template of an operation in newer versions
+
+## Symtoms
+
+If you are switching to a different operation template in a new version, you may run into compilation errors if you only leverage `@added` and `@removed` versioning decorators.
+
+## Workaround
+
+In the example below, you are switch from an old deprecated operation template to the new one. Note the uses of `@sharedRoute` and `renamedFrom` to avoid name and route conflict errors.
+
+```typespec
+  #suppress "deprecated" "back compat"
+  @removed(Versions.`2024-10-01-preview`)
+  @sharedRoute
+  @renamedFrom(Versions.`2024-10-01-preview`, "delete")
+  deleteOld is ArmResourceDeleteAsync<Employee>;
+
+  @added(Versions.`2024-10-01-preview`)
+  @sharedRoute
+  delete is ArmResourceDeleteWithoutOkAsync<Employee>;
+```
+
+**Please note**: In the `delete is ArmResourceDeleteAsync` example above, if you are RPSaaS service, you CAN do a direct replacement with `delete is ArmResourceDeleteWithoutOkAsync`. This is because RPSaaS will never send `200 OK`. Update in-place is just an API spec bug fix.