Samsung released a minor firmware update for the Gear S3 Classic and Frontier. The Tizen version is bumped to 188.8.131.52 while the firmware numbers for the Gear S3 Classic and Gear S3 Frontier wearables are R770XXU2CRG3/R760XXU2CRG3, respectively. The size of the package is just 16.3MB.
The firmware doesn't add anything new, but fixes the battery charging and overheating issue so that's why the log says "changed battery charge algorithm". After the Tizen 3.0 update, some users reported battery ovrheating towards 90% charge so they had to remove the wearable to cool off and then put it back on the pad to charge it to 100%. No need of doing that anymore.
The usual "bug fixes and stability improvements" are at hand too. If you still haven't received the update, you can try searching for it manually from About Gear -> Update Gear software in the Samsung Gear app on your smartphone.