update instructions for string minification (#15421)

Fix minification instruction

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Author: mtopo27

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

@@ -234,11 +234,11 @@ Update the Info.plist alternate icon entry to point at the new `.heic` file.
 
 #### Option 1: Keep the format lean
 
-- Encode localized strings as plain text (`"key" = "value";`), not binary plists. Set **Strings File Output Encoding** (`STRINGS_FILE_OUTPUT_ENCODING`) to **UTF-8** in Xcode.
+- 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.
 
 #### Option 2: Strip comments automatically
 
-String files can have comments that ship with the bundle. They help during translation but take space in production. A typical comment may look like:
+If strings are encoded as text, these files can have extra comments and whitespace that ship with the bundle. They help during translation but take space in production. A typical comment may look like:
 
 ```text
 /* Title for the expired code alert. */