Add information on LGTM visibility and fix typo

Author: Felicity Chapman

change-notes/1.21/analysis-csharp.md

@@ -8,8 +8,8 @@ C# analysis now supports the extraction and analysis of many C# 8 features. For
 
 | **Query**                                     | **Tags**                                             | **Purpose**                                                                                                                                                                 |
 |-----------------------------------------------|------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| Class defines a field that uses an ICryptoTransform class in a way that would be unsafe for concurrent threads (`cs/thread-unsafe-icryptotransform-field-in-class`) | concurrency, security, external/cwe/cwe-362 | Highlights classes with fields that make use of a static `System.Security.Cryptography.ICryptoTransform` object. Using these classes in concurrent threads is dangerous. It may result an error and may also give incorrect results. |
-| Potential usage of an object implementing ICryptoTransform class in a way that would be unsafe for concurrent threads (`cs/thread-unsafe-icryptotransform-captured-in-lambda`) | concurrency, security, external/cwe/cwe-362 | Highlights instances of classes where a field of type `System.Security.Cryptography.ICryptoTransform` is captured by a lambda, and appears to be used in a thread initialization method. |
+| Class defines a field that uses an ICryptoTransform class in a way that would be unsafe for concurrent threads (`cs/thread-unsafe-icryptotransform-field-in-class`) | concurrency, security, external/cwe/cwe-362 | Highlights classes with fields that make use of a static `System.Security.Cryptography.ICryptoTransform` object. Using these classes in concurrent threads is dangerous. It may result in an error and may also give incorrect results. Results are not shown on [LGTM](https://lgtm.com/rules/1507931833866/) by default. |
+| Potential usage of an object implementing ICryptoTransform class in a way that would be unsafe for concurrent threads (`cs/thread-unsafe-icryptotransform-captured-in-lambda`) | concurrency, security, external/cwe/cwe-362 | Highlights instances of classes where a field of type `System.Security.Cryptography.ICryptoTransform` is captured by a lambda, and appears to be used in a thread initialization method. Results are not shown on [LGTM](https://lgtm.com/rules/1508141845995/) by default. |
 
 ## Changes to existing queries