[M2R] :code: should always be preceded by \ (backslash space)

[lmazuel]

See this link for why:
https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#gotchas

In practice, see this Markdown:
https://github.com/Azure/azure-rest-api-specs/blob/495c99982b1231e229c9f6309602d0f10d35730d/specification/compute/resource-manager/Microsoft.Compute/GalleryRP/preview/2020-09-30/gallery.json#L546C13-L546C273

"description": "Format: <MajorVersion>.<MinorVersion>.<Patch>"

We get today in RST:

:code:`<MajorVersion>`.:code:`<MinorVersion>`.:code:`<Patch>`

https://github.com/Azure/azure-sdk-for-python/blob/f9e8d676f6cc8b75eb1b1e31455bc3057ad5a1c1/sdk/compute/azure-mgmt-compute/azure/mgmt/compute/v2020_09_30/operations/_operations.py#L8121C10-L8121C71

Note that this is incorrect and a M2R bug, this should have been:

:code:`<MajorVersion>`.\ :code:`<MinorVersion>`.\ :code:`<Patch>`

We could also try to group any non spaced string that includes :code:, but it's unclear if that heuristic is true. The following is technically not accurate to the original description:

:code:`<MajorVersion>.<MinorVersion>.<Patch>`

[lmazuel]

I tried to do a simple PR, that needs someone to take over with unit tests, and confirm compute would be correct :)
microsoft/typespec#5373

[msyyc]

https://learn.microsoft.com/en-us/python/api/azure-mgmt-compute/azure.mgmt.compute.v2020_09_30.operations.galleryimageversionsoperations?view=azure-python#azure-mgmt-compute-v2020-09-30-operations-galleryimageversionsoperations-begin-create-or-update