Q# Code Action on adding documentation for operation is broken for @EntryPoint() decorated ones

[ricardo-espinoza]

Describe the bug

In both Visual Studio and Visual Studio Code, there is a CodeAction that suggests adding documentation to Q# operations. This action becomes unavailable when the corresponding operation is decorated with @EntryPoint().

To Reproduce

1. Start from a Q# project with a code file with contents as shown below.
2. Select the operation name.
3. Invoke Code Actions through the corresponding IDE (VS or VS Code).
4. Observe if a code action is recommended.

Expected behavior

A code action indicating "Add documentation for..." should be shown to the user.

This repro goes away if the @EntryPoint() decorator is removed.

System information

• This reproes on QDK since at least 0.15.2103.133969 (released on March 30th, 2021).
• Using Windows 10 (19043.1288) and .NET 3.1.20
• VS 16.11.5 and VSC 1.61.2

Sample Q# File

namespace vscp {

    open Microsoft.Quantum.Canon;
    open Microsoft.Quantum.Intrinsic;
    
    @EntryPoint()
    operation SayHello() : Unit {
        Message("Hello quantum world!");
    }
}

[guenp]

It looks like code actions are also not working for operations without the @EntryPoint() decorator:

[guenp]

Opened a new issue here for the issue I mentioned above: #1268