Update `README.md` file in the examples directory

[guibranco]

Describe the bug
The README.md files in the examples/dotnet/README.md and examples/php/README.md directories are outdated.

Expected behaviour
The table available data in these documents should match the table that exists at the root level of the repository: README.md

[sahalhes]

@guibranco Hey I have done PR, kindly tell if there are any changes required.

[guibranco]

I will review it in the next hour!

Thanks!

[guibranco]

@sahalhes assigned and approved!

[sahalhes]

@guibranco Thanks !