Fix comments for compression area

src/libraries/System.Formats.Tar/src/System/Formats/Tar/GnuSparseStream.cs

@@ -52,8 +52,8 @@ internal GnuSparseStream(Stream rawStream, long realSize)
             _realSize = realSize;
         }
 
-        // Parses the sparse map on first read. Populates _segments, _packedStartOffsets,
-        // and _dataStart. Throws InvalidDataException if the sparse map is malformed.
+        // Parses the sparse map on first read. Populates _segments and _packedStartOffsets.
+        // Throws InvalidDataException if the sparse map is malformed.
         private async ValueTask EnsureInitializedCoreAsync<TAdapter>(CancellationToken cancellationToken)
             where TAdapter : IReadWriteAdapter
         {
@@ -152,8 +152,7 @@ public override long Seek(long offset, SeekOrigin origin)
             }
 
             _virtualPosition = newPosition;
-            // _currentSegmentIndex is not reset here; FindSegmentFromCurrent handles
-            // backward seeks using binary search.
+            // _currentSegmentIndex is not reset here; see the Position setter for why.
             return _virtualPosition;
         }
 
@@ -330,7 +329,7 @@ private async ValueTask CopyPopulatedDataToCoreAsync<TAdapter>(FileStream destin
         }
 
         // Reads from the packed data at the given packedOffset.
-        // After EnsureInitialized, the raw stream is positioned at _dataStart and
+        // After EnsureInitialized, the raw stream is positioned at the start of the packed data and
         // _nextPackedOffset tracks how far into the packed data we've read.
         // Returns the number of bytes actually read (may be less than destination.Length).
         private async ValueTask<int> ReadFromPackedDataCoreAsync<TAdapter>(Memory<byte> destination, long packedOffset, CancellationToken cancellationToken)

src/libraries/System.Formats.Tar/src/System/Formats/Tar/TarHeader.Write.cs

@@ -531,7 +531,7 @@ private static int WritePosixMagicAndVersion(Span<byte> buffer)
             return checksum;
         }
 
-        // Writes the magic and vresion fields of a gnu entry into the specified spans.
+        // Writes the magic and version fields of a gnu entry into the specified spans.
         private static int WriteGnuMagicAndVersion(Span<byte> buffer)
         {
             int checksum = WriteLeftAlignedBytesAndGetChecksum(GnuMagicBytes, buffer.Slice(FieldLocations.Magic, FieldLengths.Magic));

src/libraries/System.IO.Compression.Brotli/src/System/IO/Compression/enc/BrotliEncoderOperation.cs

@@ -7,7 +7,7 @@ namespace System.IO.Compression
     /// Process - Process input. Encoder may postpone producing output, until it has processed enough input.
     /// Flush - Produce output for all processed input.  Actual flush is performed when input stream is depleted and there is enough space in output stream.
     /// Finish - Finalize the stream. Adding more input data to finalized stream is impossible.
-    /// EmitMetadata - Emit metadata block to stream. Stream is soft-flushed before metadata block is emitted. Metadata bloc MUST be no longer than 16MiB.
+    /// EmitMetadata - Emit metadata block to stream. Stream is soft-flushed before metadata block is emitted. Metadata block MUST be no longer than 16MiB.
     /// </summary>
     internal enum BrotliEncoderOperation
     {

src/libraries/System.IO.Compression/src/System/IO/Compression/ZipBlocks.Async.cs

@@ -266,7 +266,7 @@ public static async Task<ZipEndOfCentralDirectoryBlock> ReadBlockAsync(Stream st
 
         if (!TryReadBlockInitialize(stream, blockContents, bytesRead, out ZipEndOfCentralDirectoryBlock? eocdBlock, out bool readComment))
         {
-            // // We shouldn't get here becasue we found the eocd block using the signature finder
+            // We shouldn't get here because we found the EOCD block using the signature finder
             throw new InvalidDataException(SR.EOCDNotFound);
         }
         else if (readComment)

src/libraries/System.IO.Compression/src/System/IO/Compression/ZipBlocks.cs

@@ -1162,7 +1162,7 @@ public static unsafe ZipEndOfCentralDirectoryBlock ReadBlock(Stream stream)
 
             if (!TryReadBlockInitialize(stream, blockContents, bytesRead, out ZipEndOfCentralDirectoryBlock? eocdBlock, out bool readComment))
             {
-                // // We shouldn't get here becasue we found the eocd block using the signature finder
+                // We shouldn't get here because we found the EOCD block using the signature finder
                 throw new InvalidDataException(SR.EOCDNotFound);
             }
             else if (readComment)