[llvm] [DirectX][docs] Document DXContainer format (PR #90908)

[Damyan Pepper via llvm-commits]

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@@ -78,9 +79,11 @@ both ``DXBC`` and ``DXIL`` outputs, and the ultimate goal is to support both as
 code generation targets in LLVM, the LLVM codebase uses a more neutral name,
 ``DXContainer``.
 
-The ``DXContainer`` format is sparsely documented in the functional
+The ``DXcontainer`` format is sparsely documented in the functional
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damyanp wrote:

Is the change to lowercase "c" here intentional?  It looks like it is capitalized everywhere else.

https://github.com/llvm/llvm-project/pull/90908