Update to reflec that glossaries are no longer available for all languages DeepL supports.

Author: morsssss

api-reference/glossaries.mdx

@@ -294,7 +294,7 @@ User-Agent: YourApp/1.2.3
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 ### Listing language pairs
-The `/glossary-language-pairs` endpoint lists all the language pairs - the source and target languages - that glossaries support. Since glossaries now work for all languages DeepL supports, this list will be quite long. We recommend that you instead use [the /languages endpoint](/api-reference/languages).
+The `/glossary-language-pairs` endpoint lists all the language pairs - the source and target languages - that glossaries support. Since DeepL supports many glossary languages, this list is quite long. We recommend that you instead use [the /languages endpoint](/api-reference/languages).
 
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