[docs] Fix a typo in CppInteroperabilityManifesto.md (#34345)
[docs] Fix a typo in CppInteroperabilityManifesto.md (#34345)

The "bridging-std-string" section contained a typo in the C++ header example, compared to the imported Swift header.
parkera/swift,jmgc/swift,gregomni/swift,apple/swift,parkera/swift,JGiola/swift,ahoppen/swift,hooman/swift,jmgc/swift,jmgc/swift,JGiola/swift,glessard/swift,roambotics/swift,atrick/swift,JGiola/swift,parkera/swift,benlangmuir/swift,ahoppen/swift,xwu/swift,jmgc/swift,roambotics/swift,apple/swift,rudkx/swift,atrick/swift,xwu/swift,rudkx/swift,rudkx/swift,parkera/swift,hooman/swift,xwu/swift,JGiola/swift,benlangmuir/swift,hooman/swift,roambotics/swift,JGiola/swift,xwu/swift,glessard/swift,gregomni/swift,benlangmuir/swift,tkremenek/swift,roambotics/swift,hooman/swift,jmgc/swift,glessard/swift,rudkx/swift,roambotics/swift,ahoppen/swift,rudkx/swift,ahoppen/swift,gregomni/swift,rudkx/swift,JGiola/swift,tkremenek/swift,jmgc/swift,benlangmuir/swift,apple/swift,atrick/swift,roambotics/swift,xwu/swift,atrick/swift,gregomni/swift,tkremenek/swift,parkera/swift,gregomni/swift,glessard/swift,apple/swift,glessard/swift,apple/swift,xwu/swift,atrick/swift,parkera/swift,jmgc/swift,benlangmuir/swift,tkremenek/swift,tkremenek/swift,hooman/swift,ahoppen/swift,parkera/swift,ahoppen/swift,parkera/swift,tkremenek/swift,glessard/swift,xwu/swift,apple/swift,tkremenek/swift,benlangmuir/swift,atrick/swift,gregomni/swift,hooman/swift,hooman/swift