docs: fix deprecation notice for --rm-dist -> --clean (#3733)

<!-- If applied, this commit will... -->
Fix the deprecation notice page to reference the correct new flag
replacing `--rm-dist`

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<!-- Why is this change being made? -->
The documentation for this deprecation seems incorrect, and live on the
main page.

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<!-- # Provide links to any relevant tickets, URLs or other resources
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https://goreleaser.com/deprecations/#-rm-dist
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I used this commit to reference what it was being changed to:
4954815

www/docs/deprecations.md

@@ -41,7 +41,7 @@ Description.
 
 > since 2023-01-17 (v1.15.0)
 
-`--rm-dist` has been deprecated in favor of `--rm-dist`.
+`--rm-dist` has been deprecated in favor of `--clean`.
 
 === "Before"
 
@@ -50,8 +50,9 @@ Description.
     ```
 
 === "After"
+
     ```bash
-    goreleaser --rm-dist
+    goreleaser --clean
     ```
 
 ### archives.rlcp