Update git submodules

* Update docs/submodules/externalapi/nbi.git from branch 'master'
  to 3b2a37a2abe81d05a1025e2e203361215f4008e4
  - Fix Category Check for E2E Network slicing use case
    
    Issue-ID: EXTAPI-423
    
    Signed-off-by: Priyadharshini <priyadharshini.b96@wipro.com>
    Change-Id: I98af0879c71564e9ad9c6a7efb8cb57ae407e8f4
    
1 file changed