fix encoding for minification (#15429)

fix typo in instruction

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Author: mtopo27

docs/platforms/apple/guides/ios/size-analysis/insights.mdx

@@ -234,7 +234,7 @@ Update the Info.plist alternate icon entry to point at the new `.heic` file.
 
 #### Option 1: Keep the format lean
 
-- Use the newer [String Catalog](https://developer.apple.com/documentation/xcode/localizing-and-varying-text-with-a-string-catalog) to store strings in a more efficient format. Ensure STRINGS_FILE_OUTPUT_ENCODING is set to bplist to get an efficient encoding that automatically strips whitespace and comments.
+- Use the newer [String Catalog](https://developer.apple.com/documentation/xcode/localizing-and-varying-text-with-a-string-catalog) to store strings in a more efficient format. Ensure `STRINGS_FILE_OUTPUT_ENCODING = binary` to get an efficient encoding that automatically strips whitespace and comments.
 
 #### Option 2: Strip comments automatically