add new argumentexceptions for brotlistream (#8648)

Author: gewarren

xml/System.IO.Compression/BrotliStream.xml

@@ -60,6 +60,7 @@
         <param name="compressionLevel">One of the enumeration values that indicates whether to emphasize speed or compression efficiency when compressing data to the stream.</param>
         <summary>Initializes a new instance of the <see cref="T:System.IO.Compression.BrotliStream" /> class by using the specified stream and compression level.</summary>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentException">.NET 7 and later: <paramref name="compressionLevel" /> is not defined in the <see cref="System.IO.Compression.CompressionLevel" /> enumeration.</exception>
       </Docs>
     </Member>
     <Member MemberName=".ctor">
@@ -125,6 +126,7 @@
           <see langword="true" /> to leave the stream open after disposing the <see cref="T:System.IO.Compression.BrotliStream" /> object; otherwise, <see langword="false" />.</param>
         <summary>Initializes a new instance of the <see cref="T:System.IO.Compression.BrotliStream" /> class by using the specified stream and compression level, and optionally leaves the stream open.</summary>
         <remarks>To be added.</remarks>
+        <exception cref="T:System.ArgumentException">.NET 7 and later: <paramref name="compressionLevel" /> is not defined in the <see cref="System.IO.Compression.CompressionLevel" /> enumeration.</exception>
       </Docs>
     </Member>
     <Member MemberName=".ctor">