Fix mistakes in change notes

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: owen-mc

go/ql/lib/change-notes/2026-06-08-fix-result-nodes.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* `DataFlow::ResultNode`s are no longer created for returned expressions in functions with named result parameters. In this case there are already result nodes corresponding to `IR::ResultReadInstruction`s at the end of the function body.
+* `DataFlow::ResultNode`s are no longer created for returned expressions in functions with named result parameters. In this case there are already result nodes corresponding to `IR::ReadResultInstruction`s at the end of the function body.

go/ql/lib/change-notes/2026-06-08-functypeexpr-getnumresult.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* `FuncTypeExpr.getNumResults()` now gets the number of result parameters. It previously got the number of result declarations, which is different when one result declaration declares more than one variable, as in `x, y int`. All uses of it expected the number of result parameters. Its QLDoc has been updated.
+* `FuncTypeExpr.getNumResult()` now gets the number of result parameters. It previously got the number of result declarations, which is different when one result declaration declares more than one variable, as in `x, y int`. All uses of it expected the number of result parameters. Its QLDoc has been updated.