Add short-form -v example to .NET CLI global options documentation

[abhiramch018]

Type of issue

Missing example

Description

The .NET CLI global options section lists --verbosity but doesn’t show any example using the short-form -v.
It might not be clear to new users that dotnet build -v normal is equivalent to dotnet build --verbosity normal.

Suggested fix

Add one or two short-form examples to the "Global options" section, like:

dotnet build -v quiet
dotnet publish -v detailed
Page URL
https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet
Content source
https://github.com/dotnet/docs/blob/main/docs/core/tools/dotnet.md
Why this helps

Clarifies that both long and short forms are supported across CLI commands.