Modify Rule S2699: Fix Typos (#3482)

rules/S2699/csharp/rule.adoc

@@ -31,7 +31,7 @@ By enforcing the presence of assertions, this rule aims to enhance the reliabili
 
 Test methods that include a call to a custom assertion method will not raise any issues.
 
-== How to fix it
+=== How to fix it
 
 To address this issue, you should include assertions to validate the expected behavior.
 Choose an appropriate assertion method provided by your testing framework (such as MSTest, NUnit, xUnit) or select a suitable assertion library like FluentAssertions, NFluent, NSubstitute, or Shouldly.
@@ -68,7 +68,7 @@ public static class Validator
 public class AssertionMethodAttribute : Attribute { }
 ----
 
-== Hot to fix it in MSTest
+== How to fix it in MSTest
 
 === Code examples
 
@@ -97,7 +97,7 @@ public void Add_SingleNumber_ReturnsSameNumber()
 }
 ----
 
-== Hot to fix it in NUnit
+== How to fix it in NUnit
 
 === Code examples
 
@@ -126,7 +126,7 @@ public void Add_SingleNumber_ReturnsSameNumber()
 }
 ----
 
-== Hot to fix it in xUnit
+== How to fix it in xUnit
 
 === Code examples