Nested resource argument description collides with top level argument of the same name

[estellesoulard]

What happened?

I have a Terraform resource with the following argument reference pattern, where one argument (named my_variable) appears 2 times in 2 different contexts with different descriptions, once in the top level and once in a nested block:

## Argument Reference

- `my_variable` - Description A.
- `my_list` - List of nested configs.
	  - `my_variable` - Description B.

Once Crossplane files are generated, all instances of my_variable in the generated files have the Description A., even the nested ones. This is true for the CRDs, the provider-metadata, and zz_*.go files.

Additionally, in the provider-metadata.yaml argumentDocs, my_variable appears only once (it appears arguments are listed in alphabetical order with no notion of nesting, so the second occurrence is completely overridden).

Expected behaviour

Nested arguments are handled in their specific context, and the generated files properly handle their descriptions independently.