message: Document where-operation-match directive.
diff: @@ -8,22 +8,24 @@ Those directives are defined [here](https://github.com/Azure/autorest/blob/main/
  ### Selecting operation
  -````yaml
  +```yaml
  directive:
  - where-operation: <operationId>
  transform: ... # Your transform code
  - where-operation-match: <fullregex with // and flags>
  transform: ... # Your transform code
  +```
  +
  +Examples:
  -Example:
  ```yaml
  - where-operation: MyOperation
  transform: $["x-marked"] = true
  - where-operation-match: /mygroup_.*/i
  transform: $["x-marked"] = true
  -````
  +```
  ### Selecting model
  @@ -40,6 +42,8 @@ directive:
  ```yaml
  directive:
  - remove-operation: <operationId>
  +
  + - remove-operation-match: <regex>
  ```
  Examples:
  @@ -48,6 +52,9 @@ Examples:
  directive:
  # Remove operation with operationId: Foo_Get
  - remove-operation: Foo_Get
  +
  + # Remove all operations with matching operationIds
  + - remove-operation-match: /^foo_g.*/i
  ```
  ### Rename operation
  