docs: Clarify README section for document minification

Author: JanEbbing

README.md

@@ -213,7 +213,7 @@ using the following keys:
 
 -   `formality`: same as in [Text translation options](#text-translation-options).
 -   `glossary`: same as in [Text translation options](#text-translation-options).
--   `minification`: A `bool` value. If set to `true`, the library will try to minify a document before translating it through the API, sending a smaller document if the file contains a lot of media. This is currently only supported for `pptx` files. See also [Document minification](#document-minification). Note that this only works in the high-level `translateDocument` method, not `uploadDocument`.
+-   `minification`: A `bool` value. If set to `true`, the library will try to minify a document before translating it through the API, sending a smaller document if the file contains a lot of media. This is currently only supported for `pptx` files. See also [Document minification](#document-minification). Note that this only works in the high-level `translateDocument` method, not `uploadDocument`. However, the behavior can be emulated by creating a new `DocumentMinifier` object and calling the minifier's methods in between.
 
 The `uploadDocument` function also supports these options.