Update git submodules

* Update docs/submodules/integration.git from branch 'master'
  to a48752e10bd5dfa7588fe33fb7d6bff40f137731
  - [INT-1450] : Documentation of PNF Software Upgrade
    
    This contains documentation for PNF Software Upgrade
    with direct Netconf/Yang interface with PNF
    
    Issue-ID: INT-1450
    Signed-off-by: Darragh Egan <darragh.egan@est.tech>
    Change-Id: I58acec3baed757bdc8cad2e2588c560f31c9025c
    
1 file changed