Update of ClassicAsserts documentation

[OsirisTerje]

Updated the classic asserts to reflect the changes in 4.5.0 wrt the new extension methods that allow you to use the Assert class and the NUnit.Framework namespace for these.

[Copilot]

Pull request overview

Updates NUnit documentation snippets and classic-assertion docs to reflect NUnit 4.5.0’s classic-assert extension methods, favoring Assert.* (with using NUnit.Framework) over ClassicAssert for many classic assertions.

Changes:

• Updated snippets to use Assert.* in place of ClassicAssert.*, and modernized one snippet to use collection expressions.
• Split collection assertion examples into a new ClassicCollectionAssertExamples.cs snippet file.
• Updated classic assertion documentation pages (titles + signatures) and added a new “classic extensions” mapping document; updated the classic model page accordingly.

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 31 comments.

Show a summary per file

File	Description
docs/snippets/Snippets.NUnit/ClassicVsConstraintAssertions.cs	Removes legacy import and updates examples to use Assert.* and modern array syntax.
docs/snippets/Snippets.NUnit/ClassicCollectionAssertExamples.cs	New snippet file containing CollectionAssert examples in NUnit.Framework.Legacy.
docs/snippets/Snippets.NUnit/ClassicAssertExamples.cs	Replaces ClassicAssert.* usage with Assert.* extension method syntax.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Zero.md	Renames to Assert.Zero and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.True.md	Renames to Assert.True and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Positive.md	Renames to Assert.Positive and updates examples/signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Null.md	Renames to Assert.Null and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.NotZero.md	Renames to Assert.NotZero and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.NotNull.md	Renames to Assert.NotNull and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Negative.md	Renames to Assert.Negative and updates examples/signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.LessOrEqual.md	Renames to Assert.LessOrEqual and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Less.md	Renames to Assert.Less and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsNotInstanceOf.md	Renames to Assert.IsNotInstanceOf and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsNotEmpty.md	Renames to Assert.IsNotEmpty and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsNotAssignableFrom.md	Renames to Assert.IsNotAssignableFrom and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsNaN.md	Renames to Assert.IsNaN and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsInstanceOf.md	Renames to Assert.IsInstanceOf and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsEmpty.md	Renames to Assert.IsEmpty and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.IsAssignableFrom.md	Renames to Assert.IsAssignableFrom and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.GreaterOrEqual.md	Renames to Assert.GreaterOrEqual and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Greater.md	Renames to Assert.Greater and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.False.md	Renames to Assert.False and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.Contains.md	Renames to Assert.Contains and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.AreSame.md	Renames to Assert.AreSame and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.AreNotSame.md	Renames to Assert.AreNotSame and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.AreNotEqual.md	Renames to Assert.AreNotEqual and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/classic-assertions/Assert.AreEqual.md	Renames to Assert.AreEqual and updates signatures + adds version note.
docs/articles/nunit/writing-tests/assertions/assertion-models/classic_extensions.md	New mapping doc describing classic-assert extension methods and usage.
docs/articles/nunit/writing-tests/assertions/assertion-models/classic.md	Updates classic model page to explain 4.5.0 extension methods and refreshes links.

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