Remove .NET Framework remarks (System.Security.Cryptography)

[gewarren]

.NET Framework API ref has moved to its own repo (https://github.com/dotnet/dotnetfw-api-docs), so we can clean up .NET Framework remarks, exceptions, and code examples out of this repo. Contributes to #12513.

Removes remarks and examples related to:

• .NET Framework versions
• Code-access security
• Configuring apps via app.config file
• App domains

Also removes all remarks from obsolete APIs.

Hide whitespace changes

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-security, @vcsjones

[Copilot]

Pull request overview

This PR updates the .NET API reference XML docs in System.Security.Cryptography* to remove .NET Framework-specific remarks, exceptions, and usage notes now that .NET Framework API reference docs have moved to a separate repo.

Changes:

• Removed or rewrote remarks that referenced .NET Framework-only features and behaviors (CAS, app.config, AppDomains, framework-version notes).
• Normalized several exception descriptions to remove framework qualifiers (for example, “In all cases.”).
• Cleaned up and reflowed various remarks blocks and IMPORTANT/NOTE callouts.

Reviewed changes

Copilot reviewed 41 out of 41 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
xml/System.Security.Cryptography/SymmetricAlgorithm.xml	Rewords remarks to drop .NET Framework phrasing and adjusts Create() docs.
xml/System.Security.Cryptography/SHA256.xml	Removes .NET Framework-specific return/exception details for Create overloads.
xml/System.Security.Cryptography/RSACryptoServiceProvider.xml	Removes AppDomain/version-specific wording from UseMachineKeyStore remarks.
xml/System.Security.Cryptography/RSACng.xml	Removes .NET Framework version-specific exception behavior from VerifyHash docs.
xml/System.Security.Cryptography/RSA.xml	Removes .NET Framework version notes and normalizes exception text.
xml/System.Security.Cryptography/RijndaelManaged.xml	Removes .NET Framework vs .NET Core block-size distinctions, simplifying to modern .NET behavior.
xml/System.Security.Cryptography/ProtectedData.xml	Rewords Windows-only support notes and adds/updates PlatformNotSupportedException text.
xml/System.Security.Cryptography/Oid.xml	Updates property summaries to reflect init-only narrative (but signatures still show settable).
xml/System.Security.Cryptography/KeyedHashAlgorithm.xml	Removes .NET Framework versioning notes; normalizes PNSE text.
xml/System.Security.Cryptography/HMACSHA512.xml	Removes legacy .NET Framework 2.0 SP notes and replaces with placeholder remarks.
xml/System.Security.Cryptography/HMACSHA384.xml	Removes legacy .NET Framework 2.0 SP notes and replaces with placeholder remarks.
xml/System.Security.Cryptography/HMAC.xml	Removes config-system mention and normalizes PNSE text.
xml/System.Security.Cryptography/HashAlgorithm.xml	Removes obsoletion/version notes and normalizes PNSE text.
xml/System.Security.Cryptography/FromBase64Transform.xml	Converts markdown remarks to XML paragraphs for CanTransformMultipleBlocks.
xml/System.Security.Cryptography/ECDsa.xml	Rewords remarks/parameter guidance to remove .NET Framework mention.
xml/System.Security.Cryptography/ECDiffieHellmanPublicKey.xml	Rewords PlatformNotSupportedException descriptions to remove framework qualifiers.
xml/System.Security.Cryptography/ECDiffieHellmanCngPublicKey.xml	Normalizes whitespace and replaces some .NET Framework-specific remarks/exceptions.
xml/System.Security.Cryptography/ECDiffieHellmanCng.xml	Removes argument/format exception documentation and normalizes PNSE text.
xml/System.Security.Cryptography/ECDiffieHellman.xml	Rewords remarks to remove .NET Framework mention and reformats lists.
xml/System.Security.Cryptography/DSACryptoServiceProvider.xml	Removes AppDomain/version-specific wording from UseMachineKeyStore remarks.
xml/System.Security.Cryptography/CryptoStream.xml	Removes .NET Framework comparison from partial-read IMPORTANT notes and async remarks.
xml/System.Security.Cryptography/CryptoConfig.xml	Removes .NET Framework config file references and partial-trust/CAS-related remarks.
xml/System.Security.Cryptography/CngProvider.xml	Removes “service packs / .NET Framework releases” wording from remarks.
xml/System.Security.Cryptography/CngKeyBlobFormat.xml	Removes “service packs / .NET Framework releases” wording from remarks.
xml/System.Security.Cryptography/CngAlgorithmGroup.xml	Removes “service packs / .NET Framework releases” wording from remarks.
xml/System.Security.Cryptography/CngAlgorithm.xml	Removes “service packs / .NET Framework releases” wording from remarks.
xml/System.Security.Cryptography/AsymmetricAlgorithm.xml	Removes config-system mention and normalizes PNSE text.
xml/System.Security.Cryptography/AsnEncodedData.xml	Rewords remarks to remove .NET Framework mention and trims extra whitespace.
xml/System.Security.Cryptography.Xml/SignedXml.xml	Removes .NET Framework version-specific certificate-verification notes.
xml/System.Security.Cryptography.Xml/EncryptedXml.xml	Rewords remarks to remove .NET Framework mention and trims redundant constructor remarks.
xml/System.Security.Cryptography.X509Certificates/X509Store.xml	Removes .NET Framework version-based IDisposable guidance and replaces dispose remarks.
xml/System.Security.Cryptography.X509Certificates/X509ExtensionCollection.xml	Rewords SyncRoot remarks to remove .NET Framework phrasing.
xml/System.Security.Cryptography.X509Certificates/X509Extension.xml	Rewords list intro to remove .NET Framework mention and reformats list.
xml/System.Security.Cryptography.X509Certificates/X509ChainStatusFlags.xml	Removes .NET Framework-introduced version note for certain flags.
xml/System.Security.Cryptography.X509Certificates/X509Chain.xml	Removes .NET Framework version-based IDisposable guidance and replaces dispose remarks.
xml/System.Security.Cryptography.X509Certificates/X509Certificate2.xml	Removes .NET Framework-only permission/version notes and normalizes PNSE text.
xml/System.Security.Cryptography.X509Certificates/X509Certificate.xml	Removes .NET Framework version-based IDisposable guidance and replaces various remarks/exceptions.
xml/System.Security.Cryptography.Pkcs/SignerInfo.xml	Removes CAS permission notes and normalizes countersignature remarks spacing.
xml/System.Security.Cryptography.Pkcs/SignedCms.xml	Removes CAS permission notes; normalizes silent parameter doc and exception text.
xml/System.Security.Cryptography.Pkcs/EnvelopedCms.xml	Removes .NET Framework vs .NET Core algorithm-default notes and CAS permission remarks.
xml/System.Security.Cryptography.Pkcs/CmsSigner.xml	Removes .NET Framework-only support note and normalizes PNSE text.

[BillWagner]

This LGTM.

[bartonjs]

Other than the potential followup to normalize returns statements for always-throw methods, LGTM.