C#: Update change note based on review comment.

Author: michaelnebel

csharp/ql/src/change-notes/2022-08-24-remove-cil-flag.md

@@ -1,4 +1,4 @@
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 category: minorAnalysis
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-* The `--cil` flag that could be provided to the `codeql` CLI has been replaced by an extactor option. Furthermore, the extractor default is now set to do CIL extraction. To disable CIL extraction provide `-Ocil=false` to the CLI.
+* A new extractor option has been introduced for disabling CIL extraction. Either pass `-Ocil=false` to the `codeql` CLI or set the environment variable `CODEQL_EXTRACTOR_CSHARP_OPTION_CIL=false`.