checksum_does_not_match_error.md: clarify instructions (Homebrew#62073)

* checksum_does_not_match_error.md: clarify instructions

* Update checksum_does_not_match_error.md

Author: vitorgalvao

doc/reporting_bugs/checksum_does_not_match_error.md

@@ -1,10 +1,9 @@
-First, check if the problem was with your download. Delete the downloaded file (its location will be pointed out right under the `Actual` shasum line) and try again.
+First, check if the problem was with your download. Delete the downloaded file (its location will be pointed out in the error message) and try again.
 
 If the problem persists, the cask must be outdated. It’ll likely need a new version, but it’s possible the version has remained the same (happens occasionally when the vendor updates the app in place).
 
 1. Go to the vendor’s website (`brew cask home {{cask_name}}`).
-    * Alternatively, if it has an `appcast`, read that (`curl "$(brew cask _stanza appcast {{cask_name}})"`).
-2. Find out what the latest version is. It will likely be expressed in the URL used to download it.
+2. Find out what the latest version is. It may be expressed in the URL used to download it.
 3. Take a look at the cask’s version (`brew cask _stanza version {{cask_name}}`) and verify it is indeed outdated. If it is:
 
 Help us by [submitting a fix](https://github.com/Homebrew/homebrew-cask/blob/master/CONTRIBUTING.md#updating-a-cask). If you get stumped, [open an issue](https://github.com/Homebrew/homebrew-cask/issues/new?template=01_bug_report.md) explaining your steps so far and where you’re having trouble.