updated to include Shir's commit and disclaimer

Author: Parvati-DeepL

docs/learning-how-tos/examples-and-guides/translating-between-variants.mdx

@@ -47,6 +47,8 @@ curl -X POST 'https://api.deepl.com/v2/write/rephrase' \
 
 <Warning>
 For longer texts, the Write API may rephrase and enhance content beyond simple variant conversion. If you need to maintain the exact structure while only updating locale-specific spelling and grammar, use another method.
+
+Please note that currently, the methods outlined below are not fully supported for this use case and may not always perform as intended. We encourage you to conduct your own evaluations.
 </Warning>
 
 ### 2. Style rules with custom instructions