Missing information

### Type of issue

Typo

### Description

There is a hole in the documentation.

There is a lot of information, but nothing about how the expression is sued and nothing about what the return value from the expression, when executed, is calculated.

### Page URL

https://learn.microsoft.com/en-us/dotnet/api/system.linq.expressions.expression.greaterthan?view=netframework-4.6.2&devlangs=csharp&f1url=%3FappId%3DDev17IDEF1%26l%3DEN-US%26k%3Dk(System.Linq.Expressions.Expression.GreaterThan)%3Bk(SolutionItemsProject)%3Bk(TargetFrameworkMoniker-.NETFramework%2CVersion%3Dv4.6.2)%3Bk(DevLang-csharp)%26rd%3Dtrue

### Content source URL

https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.Linq.Expressions/Expression.xml

### Document Version Independent Id

006c331d-d996-08a2-b2e2-c47a839be498

### Platform Id

9b7da73c-3b16-e2d4-6743-4ee87dcab452

### Article author

@dotnet-bot