Remove alpha label from context parameter in README

README.md

@@ -126,8 +126,7 @@ foreach (var formality in new[] { Formality.Less, Formality.More }) {
 - `GlossaryId`: specifies a glossary to use with translation, as a string
   containing the glossary ID.
 - `Context`: specifies additional context to influence translations, that is not
-  translated itself. Note this is an **alpha feature**: it may be deprecated at
-  any time, or incur charges if it becomes generally available.
+  translated itself. Characters in the `context` parameter are not counted toward billing.
   See the [API documentation][api-docs-context-param] for more information and
   example usage.
 - `TagHandling`: type of tags to parse before translation, options are