Update README.md

Author: alii94

README.md

@@ -38,7 +38,7 @@
  - [Structure Types](#structure-types)
  - [Tuple Types](#tuple-types)
  - [Nullable Value Types](#nullable-value-types)
- - [Date & Time Types](#date-&-time-types)
+ - [DateTime Type](#datetime-type)
  - [Reference Types](#reference-types)
  - [Built-In Reference Types](#built-in-reference-types)
  - [Object Types](#object-types)
@@ -571,9 +571,9 @@ else
 **Learn More:**
 https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/nullable-value-types
 
-#### Date & Time Types
+#### DateTime Type
 
-DatetTime
+DateTime
 
 TimeSpan