Update managed-identity-best-practices.md (#26139)

documentation/development-docs/design-guidelines/managed-identity-best-practices.md

@@ -67,7 +67,7 @@ autorest.powershell is unable to transform IdentityType as the best practice des
 - Include a customization script to transform the parameter IdentityType to EnableSystemAssignedIdentity by `get` + `patch` update for this type of operation. The following are the detailed steps on how to accomplish this.
  - disable transformation for the operation which reported error in README.md by
  ```
- disable-transform-identity-type-for-operation
+ disable-transform-identity-type-for-operation:
  - Operation_id
  ```
  - hide the corresponding Update cmdlet in directive by