Update release notes docs for v3.7.3 release
Update release notes docs for v3.7.3 release

(cherry picked from commit b9fc2199c00ae582b904e5644dfff258371b5cc6)

9prady9/arrayfire,9prady9/arrayfire,9prady9/arrayfire,umar456/arrayfire,umar456/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire,umar456/arrayfire,9prady9/arrayfire,arrayfire/arrayfire,arrayfire/arrayfire,umar456/arrayfire