Update mstest0016.md (#43030)

Author: engyebrahim

docs/core/testing/mstest-analyzers/mstest0016.md

@@ -30,11 +30,11 @@ A test class should have a test method.
 
 ## Rule description
 
-A test class should have at least one test method or be `static` and have methods that are attributed with `[AssemblyInitialization]` or `[AssemblyCleanup]`.
+A test class should have at least one test method or be `static` and have methods that are attributed with `[AssemblyInitialize]` or `[AssemblyCleanup]`.
 
 ## How to fix violations
 
-Ensure that the test class has a test method or is `static` and has methods attributed with `[AssemblyInitialization]` or `[AssemblyCleanup]`.
+Ensure that the test class has a test method or is `static` and has methods attributed with `[AssemblyInitialize]` or `[AssemblyCleanup]`.
 
 ## When to suppress warnings