[llvm] Refine the examples in the debug info document (PR #86272)

[Felipe de Azevedo Piovezan via llvm-commits]

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@@ -115,10 +119,12 @@ Examples of transformations for which this rule *does not* apply include:
   single-stepping experience. The rule for
   :ref:`dropping locations<WhenToDropLocation>` should apply here.
 
-* Hoisting identical instructions which appear in several successor blocks into
-  a predecessor block (see ``BranchFolder::HoistCommonCodeInSuccs``). In this
-  case there is no single merged instruction. The rule for
-  :ref:`dropping locations<WhenToDropLocation>` applies.
+* Hoisting/sinking a part of the identical instructions with the same location.
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felipepiovezan wrote:

The sentence above reads a bit broken, it's unclear what "a part of the identical instructions" is.
Maybe something like: "Hoisting/sinking that would make a location reachable when it previously wasn't"

https://github.com/llvm/llvm-project/pull/86272