Fix a parse error at targets/targets.json.
Fix a parse error at targets/targets.json.

svogl/mbed-os,YarivCol/mbed-os,betzw/mbed-os,mazimkhan/mbed-os,karsev/mbed-os,kjbracey-arm/mbed,infinnovation/mbed-os,c1728p9/mbed-os,mazimkhan/mbed-os,HeadsUpDisplayInc/mbed,andcor02/mbed-os,HeadsUpDisplayInc/mbed,HeadsUpDisplayInc/mbed,ryankurte/mbed-os,Archcady/mbed-os,mbedmicro/mbed,catiedev/mbed-os,HeadsUpDisplayInc/mbed,YarivCol/mbed-os,svogl/mbed-os,betzw/mbed-os,CalSol/mbed,mazimkhan/mbed-os,nRFMesh/mbed-os,c1728p9/mbed-os,mazimkhan/mbed-os,CalSol/mbed,svogl/mbed-os,infinnovation/mbed-os,YarivCol/mbed-os,CalSol/mbed,svogl/mbed-os,kjbracey-arm/mbed,kjbracey-arm/mbed,Archcady/mbed-os,YarivCol/mbed-os,nRFMesh/mbed-os,catiedev/mbed-os,karsev/mbed-os,karsev/mbed-os,ryankurte/mbed-os,betzw/mbed-os,Archcady/mbed-os,HeadsUpDisplayInc/mbed,betzw/mbed-os,ryankurte/mbed-os,catiedev/mbed-os,karsev/mbed-os,infinnovation/mbed-os,CalSol/mbed,mazimkhan/mbed-os,kjbracey-arm/mbed,mbedmicro/mbed,betzw/mbed-os,YarivCol/mbed-os,c1728p9/mbed-os,c1728p9/mbed-os,Archcady/mbed-os,ryankurte/mbed-os,mbedmicro/mbed,mbedmicro/mbed,infinnovation/mbed-os,ryankurte/mbed-os,andcor02/mbed-os,catiedev/mbed-os,c1728p9/mbed-os,nRFMesh/mbed-os,c1728p9/mbed-os,YarivCol/mbed-os,karsev/mbed-os,infinnovation/mbed-os,CalSol/mbed,andcor02/mbed-os,betzw/mbed-os,nRFMesh/mbed-os,andcor02/mbed-os,Archcady/mbed-os,infinnovation/mbed-os,mbedmicro/mbed,svogl/mbed-os,andcor02/mbed-os,CalSol/mbed,catiedev/mbed-os,Archcady/mbed-os,andcor02/mbed-os,svogl/mbed-os,catiedev/mbed-os,nRFMesh/mbed-os,ryankurte/mbed-os,HeadsUpDisplayInc/mbed,karsev/mbed-os,mazimkhan/mbed-os,nRFMesh/mbed-os