Remove trailing periods from option descriptions

[adamralph]

Summary

The built-in options do not have trailing periods:

• https://github.com/dotnet/command-line-api/blob/cf5fd8d696450a48d3cc75a7a1792d34b5303f88/src/System.CommandLine/Properties/Resources.resx#L208
• https://github.com/dotnet/command-line-api/blob/cf5fd8d696450a48d3cc75a7a1792d34b5303f88/src/System.CommandLine/Properties/Resources.resx#L157

This PR aligns the example options with the convention set by the built-in options.

I did not touch the example arguments. There are no built-in arguments, so I'm unsure of the convention.

Note that there is one example option which contains two sentences. I left that one as-is:

• docs/docs/standard/commandline/snippets/global-options/csharp/Program.cs

  Line 53 in f00deb9

  Description = "Output verbosity level. Allowed values are q[uiet], m[inimal], n[ormal], d[etailed], and diag[nostic].",

[Copilot]

Pull request overview

This PR removes trailing periods from option descriptions in C# code examples to align with the convention established by the built-in options in System.CommandLine. The changes are limited to option descriptions only, leaving argument descriptions unchanged due to lack of built-in precedent.

Key changes:

• Removed trailing periods from option descriptions across multiple example files
• Preserved multi-sentence descriptions that require internal punctuation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
docs/standard/commandline/snippets/global-options/csharp/Program.cs	Removed trailing period from quiet option description
docs/standard/commandline/snippets/define-symbols/csharp/Program.cs	Removed trailing periods from delay, message, and verbosity option descriptions

[gewarren]

Thanks @adamralph