Update comments

src/platform/EFR32/OTAImageProcessorImpl.cpp

@@ -205,6 +205,7 @@ void OTAImageProcessorImpl::HandleProcessBlock(intptr_t context)
  }
 
  // Copy data into the word-aligned writeBuffer, once it fills write its contents to the bootloader storage
+ // Final data block is handled in HandleFinalize().
  uint32_t blockReadOffset = 0;
  while (blockReadOffset < block.size())
  {

src/platform/EFR32/OTAImageProcessorImpl.h

@@ -61,14 +61,17 @@ class OTAImageProcessorImpl : public OTAImageProcessorInterface
  */
  CHIP_ERROR ReleaseBlock();
 
+ // EFR32 platform creates a single instance of OTAImageProcessorImpl class.
+ // If that changes then the use of static members and functions must be revisited
  static uint32_t mWriteOffset; // End of last written block
  static uint8_t mSlotId; // Bootloader storage slot
  MutableByteSpan mBlock;
  OTADownloader * mDownloader;
  OTAImageHeaderParser mHeaderParser;
  const char * mImageFile = nullptr;
  static constexpr size_t kAlignmentBytes = 64;
- // Intermediate, word-aligned buffer for writing to the bootloader storage
+ // Intermediate, word-aligned buffer for writing to the bootloader storage.
+ // Bootloader storage API requires the buffer size to be a multiple of 4.
  static uint8_t writeBuffer[kAlignmentBytes] __attribute__((aligned(4)));
  // Offset indicates how far the write buffer has been filled
  static uint16_t writeBufOffset;