update doc and identation for coding convention

minuit2/inc/Minuit2/MnGlobalCorrelationCoeff.h

minuit2/inc/Minuit2/MnPosDef.h

minuit2/inc/Minuit2/MnUserFcn.h

minuit2/src/MnFumiliMinimize.cxx

minuit2/src/MnFunctionCross.cxx

minuit2/src/MnGlobalCorrelationCoeff.cxx

minuit2/src/MnHesse.cxx

minuit2/src/MnLineSearch.cxx

minuit2/src/MnMachinePrecision.cxx

minuit2/src/MnMinos.cxx

minuit2/src/MnParabolaFactory.cxx

minuit2/src/MnParameterScan.cxx

minuit2/src/MnPlot.cxx

minuit2/src/MnPosDef.cxx

minuit2/src/MnPrint.cxx

minuit2/src/MnScan.cxx

minuit2/src/MnSeedGenerator.cxx

minuit2/src/MnStrategy.cxx

minuit2/src/MnTiny.cxx

minuit2/src/MnUserFcn.cxx