Remove outdated DeflateStream 4 GB exception remarks

[Copilot]

The DeflateStream docs still stated that compressing files larger than 4 GB throws, which is no longer accurate for current .NET behavior. This update removes that stale limit statement from the affected API docs content so the published guidance matches runtime reality.

• Scope

  • Updates only DeflateStream remarks content; no API signatures, examples, or metadata changed.

• Changes

  • Removed the 4 GB exception claim from:
    • includes/remarks/System.IO.Compression/DeflateStream/.ctor_Stream_CompressionMode.md
    • xml/System.IO.Compression/DeflateStream.xml (constructor remarks block)

• Resulting doc text (excerpt)

If an instance of the <xref:System.IO.Compression.DeflateStream> class is created with the `mode` parameter equal to `Compress`, header information is inserted immediately. If no further action occurs, the stream appears as a valid, empty, compressed file.

By default, the compression level is set to <xref:System.IO.Compression.CompressionLevel.Optimal> when the compression mode is <xref:System.IO.Compression.CompressionMode.Compress>.

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