Added detailed documentation for Stream.Read(Span<byte>) method.

[jisaiaha]

This pull request enhances the documentation for the Stream.Read(Span<byte>) method. The following improvements have been made:

• Exception Handling: Added detailed exception documentation for IOException, NotSupportedException, and ObjectDisposedException to ensure that developers are aware of the possible errors this method might throw.
• Expanded Remarks: Clarified the method's behavior, including how the buffer is handled, when the position within the stream is advanced, and how exceptions affect the stream's position.
• Streamlined Structure: Removed duplicated MemberSignature and ReturnValue blocks to improve readability and maintain a clean, concise structure.
• Preserved Compatibility Information: Retained all relevant framework compatibility information, including assembly and parameter details.