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

[Stephen Tozer via llvm-commits]

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@@ -91,8 +91,11 @@ misattributed to a block containing one of the instructions-to-be-merged.
 
 Examples of transformations that should follow this rule include:
 
-* Merging identical loads/stores which occur on both sides of a CFG diamond
-  (see the ``MergedLoadStoreMotion`` pass).
+* Hoisting identical instructions from successors of a conditional branch. For
+  example, merging identical loads/stores which occur on both sides of a CFG
+  diamond (see the ``MergedLoadStoreMotion`` pass). If there are more than one
+  group of identical instructions hoisted, apply merging instruction locations
+  for each single merged instruction.
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SLTozer wrote:

I think "merging" should be replaced with "merged". Alternatively as an optional suggestion for the last sentence, "For each group of identical instructions being hoisted/sunk, the merge of all their locations should be applied to the merged instruction."

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