[Text Analytics] Edit CHANGELOG.md (#12734)

Fix minor issues

sdk/textanalytics/ai-text-analytics/CHANGELOG.md

@@ -4,7 +4,7 @@
 
 - We are now targeting the service's v3.1-preview.3 API as the default instead of v3.1-preview.2.
 - We introduced the `beginAnalyze` API which supports long-running batch process of Named Entity Recognition, Personally identifiable Information, and Key Phrase Extraction.
-- We now have added support for the recognition of healthcare entities with the introduction of the `beginAnalyzeHealthcare` API. Since the Health API is currently only available in a gated preview, you need to have your subscription on the service's allow list. Note that since this is a gated preview, AAD is not supported. For more information, see (the Text Analytics for Health documentation)[https://docs.microsoft.com/en-us/azure/cognitive-services/text-analytics/how-tos/text-analytics-for-health?tabs=ner#request-access-to-the-public-preview].
+- We now have added support for the recognition of healthcare entities with the introduction of the `beginAnalyzeHealthcare` API. Since the Health API is currently only available in a gated preview, you need to have your subscription on the service's allow list. Note that since this is a gated preview, AAD is not supported. For more information, see [the Text Analytics for Health documentation](https://docs.microsoft.com/azure/cognitive-services/text-analytics/how-tos/text-analytics-for-health?tabs=ner#request-access-to-the-public-preview).
 
 ## 5.1.0-beta.2 (2020-10-06)