Update migration.md

Author: Steven Silvester

docs/migration.md

@@ -3,34 +3,45 @@
 ## Jupyter Client 6.0 to 7.0
 
 ### API Changes
-All of the API changes for `KernelManager` and `AsyncKernelManager` in the 7.0 release were confined to _internal public_ methods, which we define as methods called from the _formally public_ methods but could be overridden in subclass implementations.  As a result, these changes may impact subclasses of `KernelManager` or `AsyncKernelManager` provided those implementations also implement or call these methods, but should not affect applications that call only the _formally public_ methods.
+
+All of the API changes for `KernelManager` and `AsyncKernelManager` in the 7.0 release were confined to _internal public_ methods, which we define as methods called from the _formally public_ methods but could be overridden in subclass implementations. As a result, these changes may impact subclasses of `KernelManager` or `AsyncKernelManager` provided those implementations also implement or call these methods, but should not affect applications that call only the _formally public_ methods.
 
 #### `KernelManager`
+
 The following internal methods had signature changes:
+
 - `def pre_start_kernel(self, **kwargs) -> Tuple[List[str], Dict[str, Any]]:`
-    - `pre_start_kernel` now returns a tuple consisting of the formatted kernel startup list and an updated set of keyword arguments.
+  - `pre_start_kernel` now returns a tuple consisting of the formatted kernel startup list and an updated set of keyword arguments.
 - `def _launch_kernel(self, kernel_cmd: List[str], **kw) -> None:`
-    - `_launch_kernel` now returns `None` instead of the `Popen` instance
+  - `_launch_kernel` now returns `None` instead of the `Popen` instance
 - These methods now take the keyword argument `restart` indicating the shutdown was on behalf of a kernel restart (when `True`).
-    - `def finish_shutdown(self, restart: bool = False):`
-    - `def _kill_kernel(self, restart: bool = False):`
-    - `def _send_kernel_sigterm(self, restart: bool = False):`
+
+  - `def finish_shutdown(self, restart: bool = False):`
+  - `def _kill_kernel(self, restart: bool = False):`
+  - `def _send_kernel_sigterm(self, restart: bool = False):`
 
 - Attribute `kernel` has been removed and _logically_ replaced with `provisioner` - which is an instance of `KernelProvisionerBase` and can be viewed as an abstract `Popen` instance.
 
 #### `AsyncKernelManager`
+
 Besides the signature and attribute changes described above, the following internal methods were made `async` for `AsyncKernelManager`:
+
 - `async def pre_start_kernel(self, **kwargs) -> Tuple[List[str], Dict[str, Any]]:`
 - `async def post_start_kernel(self, **kwargs)`
 - `async def request_shutdown(self, restart: bool = False):`
 - `async def cleanup_resources(self, restart: bool = False):`
 
 #### `ZMQSocketChannel`
+
 - `async def get_msg(self, timeout: t.Optional[float] = None) -> t.Dict[str, t.Any]:`:
   We dropped the `block: bool = True` keyword argument. Calling this method with `block=False` previously translates to calling it with `timeout=0` now.
 
 ### Deprecations removed
+
 #### Method `KernelManager.cleanup()`
-The `cleanup()` method on `KernelManager` has been removed.  `cleanup_resources(restart: bool = False)` should be used.
+
+The `cleanup()` method on `KernelManager` has been removed. `cleanup_resources(restart: bool = False)` should be used.
+
 #### Attribute `KernelManager.kernel_cmd`
-This attribute had been marked for deprecation for 4 years.  The command used to start the kernel is derived from the `argv` stanza of the kernel specification file (`kernel.json`).
+
+This attribute had been marked for deprecation for 4 years. The command used to start the kernel is derived from the `argv` stanza of the kernel specification file (`kernel.json`).