C#: Update change note

Author: hvitved

change-notes/1.20/analysis-csharp.md

@@ -9,7 +9,8 @@
 
 ## Changes to existing queries
 
-| *@name of query (Query ID)*| *Impact on results*    | *How/why the query has changed*                                  |
+| *@name of query (Query ID)*  | *Impact on results*    | *How/why the query has changed*   |
+|------------------------------|------------------------|-----------------------------------|
 | Off-by-one comparison against container length (cs/index-out-of-bounds) | Fewer false positives | Results have been removed when there are additional guards on the index. |
 | Dereferenced variable is always null (cs/dereferenced-value-is-always-null) | Improved results | The query has been rewritten from scratch, and the analysis is now based on static single assignment (SSA) forms. The query is now enabled by default in LGTM. |
 | Dereferenced variable may be null (cs/dereferenced-value-may-be-null) | Improved results | The query has been rewritten from scratch, and the analysis is now based on static single assignment (SSA) forms. The query is now enabled by default in LGTM. |